You have to think back to the 1930s and 40s. There was no internet. The NYT and all the press and plenty of movies glorified the USSR. Most people and especially poor blacks knew nothing of the millions. Hell most white people didn’t yet.
Throw in some propaganda, and juxtapose that against how blacks were treated. The water fountains, back of the bus, illegal to date or marry across the color line, segregated military etc. Socialism was promising equality and no racism.
It’s never been a highly intellectual exercise for those who choose it.
My physics teacher was a Tuskegee airman. When he was discharged, feeling like a million bucks, it took no time at all for him to be reminded to get back in his place.
Blacks were exploited by socialism. And many are still enamored with it today. Nothing wrong with learning the lesson. Actual racists today (majority are dems) are working to advance communism, just as segregationist in the 50s were. Just as Joe Biden and his racial jungle comments did.
They all deserved a paycheck from the KGB.
And yet with all that, Thurgood Marshall was a dedicated Anti-Communist Liberal. THAT is the kind of man I admire.