Earlier quoted context omitted.
Fred Hampton is the most recent in my mind that isn't (in my view) ambiguous. https://en.m.wikipedia.org/wiki/Fred_Hampton
Given the numerous trials and inquests, include one which made sure to include members of the community, it certainly seems ambiguous. I'll ignore the fact that I mentioned head of state for the purposes of discussion, but what in your mind makes the situation unambiguous? I've only know heard of Fred Hampton, outside of a Rage Against the Machine mention so I'm certainly not well informed on the matter.
Suggested reading as to why it's not ambiguous: http://m.huffpost.com/us/entry/4375527
The history of how the FBI suppressed Black, Native, Latino, and New Leftist organizations more generally is a bloody one. Cuba has never had a monopoly on authoritarian behavior in the Western Hemisphere.