Yes that horrible "peace movement" was just a front for KGB. And it was particularly well-organized
in Germany, near the Soviet Union, and filled with probably people with guilt pushed on them [rightly or wrongly]
for World War II. Hence good targets for the useful idiots of whom StephenS reminded us.
I also think that Petra Kelly's Green Party in Germany was very much backed by similar quarters in Moscow.
Notice how all the "Green" stuff became so mainstream and trendy in recent decades ?
One cannot necessarily link that to Soviet machinations. But it is something to contemplate.