When someone tells you that the 80's protests in communist Poland were inspired by the US, pro-capitalist or any other similar bullshit, just have a look at this 1980 list of 21 Interfactory Strike Committee postulates.
@kravietz To be completely fair, anything that was anti-Soviet, regardless of how otherwise socialist it might have been, would have had Western support.
Also in France you had Jean-Paul Sartre who was diehard Stalin supporter until I think late 60's!
In Germany you had Rote Arme Fraktion (RAF) and their left-wing supporters who received direct support from Stasi and spent plenty of time hiding in Eastern Bloc after especially bloody attacks.
From less exciting examples: in 1920's British socialist dockers were able to block arms shipments to Poland, which was then fighting against Soviet invasion. In the UK they *could* do it. In USSR any such action would take them straight to GULag or mass grave.