Who is Ernst Roehm from the nonfiction book, Inside the Third Reich: Memoirs?

Ernst Roehm is the brutal leader of the Sturmabteilung (SA a.k.a. Brown Shirts and storm troopers) and the Schutzstaffel (SS a.k.a. Black Shirts), Roehm is an early but rebellious associate of Adolf Hitler in Munich. After the Nazis achieve power in 1933, the SA feels cheated of the fruits of revolution. Roehm alarms Hitler by plans to launch a "second revolution" in conjunction with the army and is ordered assassinated on 30 Jun. 1934. Roehm's homosexuality is used as an excuse for the "blood purge."