When I took a couple of critical theory oriented literary courses at uni these were the names that came up again and again, but there was no mention of their ultimate transgression. This is how the myth of an entirely dangerous right and an entirely harmless left is propagated. Just don't mention the bad parts of the left and create one continuous antagonist group out of everyone from Ted Cruz to Heinrich Himmler. Every rightist is implicated in the actions of their most radical thought leaders, but leftists are afforded the luxury of not associating with characters like Foucault, Lenin or Mao at their own leisure.
And I know that you know this but a "thought leader" doesn't need to be alive, so that's not really an argument. These people are tremendously influential and popular in our time (and Butler and Rubin aren't even dead), as demonstrated by the negative response to the Derrick Jensen lecture clip linked above.