All (and many others) were killed within a five year span at the peak of COINTELPRO's efforts to prevent the emergence of a "black messiah." That's not even conspiracy theory--that shit's in the file.
Their truncated efforts fomented the rumblings that Nixon used at the end of the 1960s to seize on fears of integration and black urban migration with the euphemism "Law and Order." That became Reagan's "Morning in America," with its wars on vague concepts and its rancid downward trickles.
But unless you grew up in a disenfranchised community with some sort of minority political agitation, making those connections is just not a valid part of the study of history. If it comes at all, most Americans will only ever get that part in college--and now the motherfuckers want to take that away. Intersections like these are not simple coincidences, folks: UC tuition might jump 32% if tax proposal fails, official says.
Just because we can't point to some back room where one group of scary men in suits pulls all the world's strings doesn't mean the game's not rigged to work in the favor of a de facto aristocracy.
How many investment bankers have you seen in handcuffs?
Maybe Ahab was right when he observed that "This whole act's immutably decreed."