Russia: Jehovah’s Witnesses are terrorists, officially
hrw.org
hrw.org
I'm guessing that the Russian government doesn't like Witnesses because of either than anti-war attitude, or the won't-salute-the-flag attitude. Those are the aspects that usually put a bur under government's saddles. In any case, ordinary Witness practice might be irritating, but it's not violent. The lack of violence prevents the usual definition of "terrorism" from applying.