Well I suppose there's political and there's political.
There's an old time American socialist called Barry Sheppard - I think he's still alive, though he must be pretty ancient - who wrote a memoir of his activism in the 60s. As he tells it, he was working late at the party office one night in November 1963, putting the paper to bed, when the news came over the radio that President Kennedy had been assassinated in Dallas.
Barry swears the first words out of his mouth were "I hope it wasn't that gun nut in New Orleans who tried to join the party." Guess what...
Oswald having been a communist seems to have been almost completely memory holed, though he was a very eccentric sort of communist, and when he tried to defect to the Soviet Union it didn't take them much time to realise he was a bit of a weirdo and quickly wash their hands of him.
In this day and age, especially with gamers, it's probably a fool's errand trying to find a formal group with a consistent ideology. But if he was in American leftist or trans online communities, even as a lurker, there's constant violent rhetoric and assassination talk in those places. Some of those online communities are very big. It only takes one person to take the talk seriously.