It's so strange to me how much social paranoia there is in America over Communism and Socialism (and also how few people can tell the difference.)
Martin Luther King being referred to as Communist is quite frankly hilarious - a little left-leaning, definitely; a Socialist, probably; but Communist? Only to Americans, surely.
It reminds me a little of what happened to Paul Robeson - he's a national hero to many here in Wales, where we are Socialist af and in the 1920s - when he spent time here - were even more so. Anyway, as well as being black-listed in the film industry, the US government confiscated his passport because of his Socialism and Civil Rights activism; which then led to the 'let Robeson sing' campaign, and the what's thought to be the world's first Transatlantic concert in 1957, when Robeson sang over a phone-cable to the Porthcawl Eisteddfod (being asked to sing at an Eisteddfod - especially then - shows someone held in the highest esteem, and Robeson sang in several over the years.) -- He's thought of extremely fondly here amongst the older people, still, and considered to be Welsh (despite not even being British,) by many.