Rohm was pretty much a Communist. He advocated Nationalization of all German industry and executing the Industrialists.
Hitler was actually a fairly pragmatic man at that point....He understood he needed the industrialists to build his war machine, and they would not support Hitler until folks like Rohm were out of the picture. Also the Wehrmacht would not support Hitler, until Rohm, who advocated replacing the Military with the SA, was gone.
It wasn’t personal, it was strictly business.
Not really.
Communists are International Socialists.
Rohm was a National Socialist. (What a shock.)
Communists are merely one branch of the much larger socialist tree. Nazis are another.