MOSCOW -- Russian investigators charged street protest leader Alexei Navalny with theft Tuesday and banned him from leaving the country, threatening a heavy jail term in what supporters say is a growing crackdown on dissent by President Vladimir Putin.

Navalny, an anti-corruption blogger who has organized demonstrations that have dented Putin's authority, dismissed the charge as absurd and other opposition leaders accused Putin of using KGB-style tactics to try to silence his critics.

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Other moves which the opposition depict as a crackdown on dissent since Putin began a six-year term in May include a law increasing fines for protesters, closer controls of the Internet and tighter rules for foreign-funded campaign and lobby groups.

Russia's federal Investigative Committee said in a statement that Navalny, 36, had been charged over the theft of timber from a state firm while he was advising a regional governor in 2009, and he could face a 10-year sentence.

"I have been charged and ordered not to leave," Navalny said after emerging from the Investigative Committee headquarters, where he had been summoned for the presentation of what he had expected would be a less severe charge.

"This is really quite absurd and very strange because they have completely changed the essence of the accusation, compared to what it was before," Navalny, who had been questioned repeatedly since the case was opened in 2010, told reporters.

He made clear he would not be silenced. "I will continue to do what I have been doing, and in this sense nothing changes for me," said Navalny, who is also a lawyer. "We believe that what is happening now is illegal. We will use the methods of legal defense at our disposal. What else can we do?"

From March 2012: Anti-Putin activists pay high price, but refuse to back down

Leading voice of dissent
Navalny is one of the few people seen as capable of emerging as a viable leader of the fractious opposition, although critics say he has nationalist tendencies.

He gained prominence by fighting corruption at state-controlled companies and used the Internet to do so, appealing to a tech-savvy generation of urban Russians who have turned away from the mainstream media.

Before parliamentary elections last December he helped to energize a struggling opposition, popularizing a phrase referring to the ruling United Russia party, then headed by Putin, as the "party of swindlers and thieves."

'Serious problems' with vote that kept Putin in power, monitors say

He was also among the leaders of large protests prompted by allegations of fraud in the election on behalf of United Russia, which saw its big majority in parliament cut to a handful of seats despite the accusations that it had cheated.

'Mortal fear'
"This case has been fabricated from beginning to end," said Boris Nemtsov, a former deputy prime minister who is a prominent Putin opponent. "The true reason for what is happening is Putin's mortal fear of losing power. ... He is wildly afraid of the opposition, including Navalny."

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In a reference to the Cheka secret police, a precursor of the Soviet KGB, Nemtsov said: "Putin is using traditional Chekist methods. ... Fabricated cases, charges, arrests, jail."

Putin won a presidential election on March 4 despite the largest protests since the start of his 12-year rule, during which he has served as president for eight years and as prime minister for four. At times attendance at the rallies reached more than 100,000, witnesses said, although they have become less frequent since Putin returned to power.

But opponents say a series of steps he has taken in recent months to tighten control show the former KGB agent is worried about losing his grip on the world's largest country.

Punk rockers go on trial over anti-Putin church protest

Tough censorship law
Putin, who has repeatedly warned against rocking the boat in speeches since his election, signed a law on Monday toughening punishment for defamation and another on Tuesday that opponents say could be used to censor the Internet.

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In a case which critics say will indicate how he plans to treat opponents during his new term, three women from the punk band "Pussy Riot" went on trial Monday over an unsanctioned protest performance at the altar of Russia's main cathedral, where they called on the Virgin Mary to "throw Putin out!"

Their trial entered its second day Tuesday in a Moscow court, and they face up to seven years in jail over a protest they say was aimed against the close relationship between Putin and the Russian Orthodox Church.

Navalny had been detained and served brief terms in custody several times over administrative offenses linked to the protests, but had never been charged with a more serious crime.

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Lawyers for Navalny had said Friday they expected he would be charged over the case in Kirov province. But they had expected him to face a different charge punishable by up to five years in jail, rather than 10.

The Investigative Committee said more than 10,000 cubic meters of timber were stolen as the result of a plot between Navalny and two company chiefs, causing the regional government to lose more than 16 million roubles ($497,000).

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Updated at 9:20 a.m. ET: MOSCOW - Three women who protested against Vladimir Putin in a "punk prayer" on the altar of Russia's main cathedral went on trial Monday in a case seen as a test of the longtime leader's treatment of dissent during a new presidential term.

The members of the band Pussy Riot face up to seven years in prison for an unsanctioned performance in February in which they entered Moscow's Christ the Savior Cathedral, ascended the altar and called on the Virgin Mary to "throw Putin out!"

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Maria Alyokhina, 24, Nadezhda Tolokonnikova, 22, and Yekaterina Samutsevich, 29, were brought to Moscow's Khamovniki court for Russia's highest-profile trial since former oil tycoon Mikhail Khodorkovsky was convicted in 2010.

Governments and rights groups, as well as musicians such as Sting, the Red Hot Chili Peppers and Franz Ferdinand, have expressed concern about the trial, reflecting doubts that Putin - who is serving his third presidential term and could be in power until 2024 - will become more tolerant of dissenting voices.

On Monday, supporters chanted "Girls, we're with you!" and "Victory!" as the women, each handcuffed by the wrist to a female officer, were led from a white and blue police van into the courthouse through a side entrance. Streets around the court, on a high Moscow River embankment, were closed.

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They were led into a metal and clear-plastic courtroom cage, where they milled and spoke with lawyers as preparations began. Tolokonnikova, in a blue checkered shirt, lowered her head to speak through a small opening in the enclosure. Two pairs of handcuffs hung at the ready just beside her face.

"We did not want to offend anybody," Tolokonnikova said, speaking to a defense lawyer who stood outside the enclosure. "We admit our political guilt, but not legal guilt."

The band's stunt was designed to highlight the close relationship between the dominant Russian Orthodox Church and former KGB officer Putin, then prime minister, whose campaign to return to the presidency in a March election was backed clearly, if informally, by the leader of the church, Patriarch Kirill.

'Serious problems' with vote that kept Putin in power, monitors say

Symbolically, the trial is taking place in the same Moscow courthouse where Khodorkovsky was found guilty of stealing his own oil in a trial in 2010 that many Western politicians said looked like a crude Kremlin attempt to keep a man it saw as a political threat behind bars.

'Our motives are exclusively political'
The women are charged with hooliganism motivated by religious hatred or hostility.

But in opening statements read by a defense lawyer, who sometimes struggled with the handwritten texts, they said they were protesting against Kirill's political support for Putin and had no animosity toward the church or the faithful.

"I have never had such feelings toward anyone in the world," Tolokonnikova said in her statement. "We are not enemies of Christians ... our motives are exclusively political."

"We only want Russia to change for the better," she said.

Alyokhina's statement said: "I thought the church loved all its children, but it seems the church loves only those children who love Putin."

The women looked thinner and paler than they did when they were jailed following the performance in late February, shortly before Putin, in power as president from 2000-2008 and then as prime minister, won a six-year presidential term on March 4.

"She looks like she has been on a long hunger strike," Stanislav Samutsevich said of his daughter. "Her cheeks are hollow … I've never seen her in such a state. I think this is like an inquisition, like mockery."

A reporter on state-run Rossiya-24 television presented a different picture, focusing on occasional smiles and chuckles and an overall air of self-assuredness among the women, who whispered to each other as a prosecutor read the charges.

PhotoBlog: Topless feminist confronts Russian church patriarch

"Look at their faces; they are laughing and joking," the reporter said on the news, adding that a viewer might think they were "continuing the action" they carried out at the cathedral.

Prosecutors asked for the trial, which was streamed live on the Internet, to be closed to the public and the media, saying a "rift in society" and emotions over the case put the defendants and other participants at risk.

Envelope-pushing performances
Pussy Riot, who say they were inspired by bands such as Bikini Kill from the 1990s-era Riot Grrrl U.S. feminist punk movement, burst onto the scene this winter with angry lyrics and envelope-pushing performances, including one on Red Square, that went viral on the Internet.

The collective see themselves as part of a disenchanted generation that is looking for creative ways to show its dissatisfaction with Putin's dominance of the political landscape.

The all-girl group has no lead singer, and, in order that anyone may join, its members don multi-colored balaclavas, which have become its trademark. They numbered five when they formed in November but later expanded to 10 members, though there have been no performances in Russia since their bandmates' arrest.

Among the group's most noted outrageous acts was the drawing of an enormous phallus on a drawbridge in St. Petersburg. Several members participated in an obscene "fertility rite" at Moscow museum, mocking Dmitry Medvedev, who was elected Russian president the next day.

From March 2012: Anti-Putin activists pay high price, but refuse to back down

'Russian superhero' needed?
One member of the group, who spoke to Britain's The Observer newspaper, said members of the band masked their faces to appear anonymous in public to show that "everybody can be Pussy Riot." The 25-year-old, who spoke via video while in hiding for fear of arrest, went by the nickname "Sparrow."

She said a "Russian superhero" was needed at the moment. Wearing masks and costumes during performances, "Sparrow" told The Observer, felt like "having a second life. It's like being Spider-Man or Catwoman. ... When I'm in a mask I feel a little bit like a superhero. I feel more power. I feel really brave. I believe that I can do everything and can change the situation."

Russian Orthodox Church apologizes for Photoshopping patriarch's watch

She also told the newspaper: "It's a bit scary but we're sure what we are doing is right. … When you're doing the right thing you're not scared. Because it's horrible what's happened to the girls."

Anthony Kiedis and Flea of the Red Hot Chili Peppers spoke out in support of the group during the Calif. funk-rock band's July 22 concert in Moscow. Kiedis wore a Pussy Riot t-shirt on stage and both musicians gave letters to Pyotr Verzilov, Tolokonnikova's husband, according to The Guardian newspaper.

Church revival
The unsanctioned performance that prompted the arrest of three Pussy Riot members offended many believers in predominantly Orthodox Christian Russia, where the church has enjoyed a huge revival since the collapse of the Soviet Union in 1991.

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But while some two-thirds of the country's 142 million people are considered Russian Orthodox, the number of practicing churchgoers is far smaller in a nation where the legacy of decades of official atheism looms large.

Patriarch Kirill has said the church was "under attack by persecutors" and has encouraged pro-church demonstrations including a procession to Christ the Savior in April.

"This is only the small, visible tip of an iceberg of extremists," Mikhail Kuznetsov, a lawyer representing church security guards, said in an interview with the newspaper Moscow News last week. "They are aiming to destroy the thousand-year-old traditions of the Russian Orthodox Church, to provoke a schism, and to deceivingly bring the flock not towards God, but towards Satan."

'Harmless civil activity'
The defendants' supporters say the charges are politically-motivated.

In a poll by the independent Levada Center and released by the prominent newspaper Kommersant earlier this month, 50 percent of Muscovites said they did not support a criminal trial for the members of Pussy Riot, with 36 percent supporting the trial.

Pussy Riot's cathedral performance was part of a lively protest movement that at its peak saw 100,000 people turn out for rallies in Moscow, some of the largest in Russia since the demise of the USSR.

Reuters, The Associated Press and NBC News staff contributed to this report.

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