BTW, I did a Dogpile search using “Martin Luther King communist sympathiser” as the search term, and every link I clicked on was a refutation of the claim.
Even Snopes says NOT true.
Well, lets just say the communist sympathiser label is not proven. He was certainly an adulter though.
Also bear in mind that back in the 60s, black people were still generally republican in their sympathies because Democrats were still associated with the old dixiecrats that had held sway in the South since the Civil War. MLK would probably have transferred his allegience like many of his friends such as Jesse Jackson did to the Democrat Party had he lived...