The Black Panthers were notable, back in the 1970s, with their leaders either arrested on phony charges or killed in police raids.

Occupy Wall Street members were routinely subjected to arrest and detention in the wake of the '08 Recession.

Wikileaks was another big one in the early '10s, with its major contributors and journalists all arrested or forced into hiding.

The Black Lives Matter movement had many of its early leaders jailed or killed, before the various social media organizing tags were hijacked by online media personalities.