
Police armed with assault rifles raided the homes of Russia's top protest leaders on Monday in an unusually blunt show of force on the eve of a mass rally against President Vladimir Putin's rule.
The coordinated security sweep in the early hours of a public holiday targeted the homes of a new brand of young Russian politicians who analysts believe represent the biggest threat to ex-KGB spy Putin's 12-year rule.
Some of their supporters compared the raids to Soviet dictator Joseph Stalin's night arrests of his biggest foes during the Red Terror wave of the 1930s.
Even Putin's own human rights council adviser expressed "shock" at what to many appeared to be a blatant and previously unseen campaign to openly intimidate the Kremlin's biggest foes.
"I think that from the standpoint of social harmony, modernization and political reforms, this is the very worst that could have happened," adviser Mikhail Fedotov told Interfax.
Officers beat down the doors of the increasingly popular anti-corruption blogger Alexei Navalny as well as media celebrity and more recent Putin critic Ksenya Sobchak.
Others on the list included Sergei Udaltsov, an outspoken ultra-leftist who stages periodic hunger strikes to protest his repeated arrests, and the far more moderate democracy campaigner Ilya Yashin.
"They are taking all the electronic devices," Navalny tweeted during the raid. "Even disks with photos of the children."
Russia's powerful Investigative Committee said 10 raids were conducted as part of a probe over a May 6 demonstration "that ended in mass disturbances."
A so-called "March of Millions" that drew 20,000 people in Moscow ended in the arrest of hundreds after bloody clashes broke out between protesters and police on the eve of Putin's inauguration to a third term.
Navalny and the nine others face up to 10 years in prison if they are charged and convicted of organizing mass disturbances.
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