Originally Posted by arsevader
I see where you are coming from but that's like saying the only difference between blue and yellow is the colour. The ideology is precisely what sets them apart.
Just because communism has not lived up to its ideals in practice doesn't mean that communism is like fascism.
Ideology is different, but can compared and comes very close in certain fields.
Communism is an ideological opposite to fascism, but the application is very similar.
NKVD - Gestapo
Gulag - concentration camp
anti-semitism - anti-semitism
list goes on.