For decades, Moscow has sought to silence its critics abroad Boston 25 News [Video]

From its earliest days, the Soviet Union’s intelligence services — whether known as the Cheka or by the names of any of its successor agencies like the KGB — kept the government in power by pursuing its opponents no matter where they lived.

Intelligence experts say that policy is still followed by Russian President Vladimir Putin, himself a product of the KGB who does not disguise his scorn for perceived traitors, defectors and other political enemies abroad. The Kremlin has routinely denied involvement in such attacks.

The Cheka secret police, founded by Felix Dzherzhinsky, often used assassins to hunt down enemies of the Bolshevik Revolution.

Security expert Andrei Soldatov said the work of the Kremlin’s intelligence services, then and now, has been defined by threats from dissidents abroad.

Perhaps the Cheka’s most successful undertaking in the 1920s was “Operation Trust,” which focused on Russians living abroad who opposed the regime, he said.

The Trust was a front organization, …