@genmaicha also found a neat little historical tidbit. a letter from Leon Trotsky in 1940 (just months before he got icepicked!) to James Burnham, who was still a Trot at the time: https://www.marxists.org/archive/trotsky/idom/dm/14-burnham.htm
it reads like a boring ass reddit effortpost, but the constant references to "Comrade Burnham" are really funny in retrospect. almost makes me want to believe Burnham's fight against USSR was because he never stopped believing! revenge for Comrade Leon!