Who did he execute? The Socialists, trade unionists, anarchists, communists.What was the night of the long knives? once helped into power by powerful anti-bolshevik business interests, the nazi party was insignificant before this, the "Socialistic", read state collectivists, elements where executed as traitors to the nazi cause.
This involved executing a number of his close associates but it didnt matter to hitler.
Incidentally most Nazi's will argue with you they arent socialists and favour the economic system the pusedo-libertarians faovur only with a militarised state to ensure compliance form the proletariat.