Three lawyers who once represented the late Russian opposition leader Alexei Navalny were convicted by a court Friday as part of the Kremlin’s crackdown on dissent that has reached levels unseen since Soviet times.

Three lawyers for Alexey Navalny, the Kremlin critic who died last year in an Arctic prison, have been found guilty by a Russian court of belonging to an extremist group and jailed for several years.

Russia on Friday sentenced three lawyers who had defended Alexei Navalny to several years in prison for bringing messages from the late opposition leader from prison to the outside world.