Fascists...both the Mussolini Black Shirt type and the Hitler Brown shirt type despised Stalinist style Communism and Communists in general.
Hitler was locking them (Communists) up in the early concentration camps before he finalized his final solution for the Jews.
I read an article a while back that claimed Hitler was an informant for the German Communist Party in the early twenties before he took over as head Nazi thug.
Hitler hated communists because they rivaled him for total power. He knew that only the communists would be ruthless enough to compete with him for total control of Germany.
A lot of Nazi theory was anti-capitalist, anti-wealthy, and certainly Hitler, like the commies, wanted total control of the masses.
Solzhenitsyn considered Stalin and Hitler as ideological twins both murderous dictators who loved murder and power above everything else. According to Solzhenitsyn, Hitler was Stalin's "little brother."