The definition of "Fascism" " The dictatorship of the Capitalist Class!"
When the threat of an overthrow of "Capitalism" becomes apparent it becomes necessary to do away with any pretense toward democracy.
"Fascism" signals the end of the right to freedom of speech! Freedom to assembly! The end of civil rights! , Etc. The strict enforcement of "Law and Order"
Nazi philosophy is that part of fascism that is "Racist and bigoted!
"Socialism" is defined by having a nation that is ruled by "The Dictatorship of the Working Class!" This "Proletariat dictatorship was regarded as necessary to keep the former capitalist class from regaining power and overthrowing the dictatorship of the Working Class!"
"Communism" is defined as that which is built on a foundation of socialism.
Under communism you have a planned economy that has created the material conditions of enough abundance to allow the distribution of goods and services to be equally distributed to all of it's citizens without discrimination. "From each according to their ability! "To each according to their need!" Under communism cooperation replaces competition. Under a system of "material cooperative abundance" a new type of human nature will be born out of this type of secure environment. A social scientific being that becomes their own leader and their own follower and does not need a political government or state apparatus to tell them what to do. Consequently the "State Apparatus" withers away and you only have an administration of things, ... not an administration of people.