Enver Hoxha
Enver Hoxha was the Stalinist dictator of Albania from 1944 to 1985, and the author of many unreadable exercises in doctrinaire hairsplitting like Eurocommunism is Anti-Communism. In his paranoia he had an annoying tendency to turn on and denounce his former allies as being anti-Communist dupes and revisionists, which he did first with Yugoslavia, then the Soviet Union, and finally with his sole remaining ally China. As a result, Albania was led into isolation from the rest of the world and for much of his reign was the poorest country in Europe.
He also took Marx's "opiate of the masses" line to its logical conclusion by banning organized religion from Albania.
North Korea is probably less popular now than Albania was then, but only just. The nukes are the tiebreaker.