WEB Dubois and Robeson most definitely were commies. King flirted with socialism near the end of the life.
King did a lot more than “flirt” with Socialism. Look up Jack O’Dell, Bayard Rustin, Stanley Levison, to name just 3.
It’s the main reason why the FBI started wiretaps-although contrary to popular belief, J. Edgar Hoover didn’t initiate this on his own-he was acting on orders from his boss, Bobby Kennedy, who was acting on orders from his boss, John F. Kennedy. I think JFK drafted the Exec. Order for this in Oct 1963, a month or so before his death.