It used to be that fascists and communists were our most hated enemies. How the tables have turned!
EDIT: more seriously, though, throughout the 20th century America hewed much closer to fascism than communism. It's always been there, if not always out in the open.
They are more or less the same thing. Fascism in its original form (with that name) in Italy one century ago had an anti communism flavor because communists were its internal enemies to the road of power. Remove that and you are left with nationalism, control of society (what you can say in pubblic, how to behave) and control of economy even in something as thin as do as you please but do not challenge the big boss with the influence you gain with your money (see what happened in China a few years ago.)
Communism had an internationalist phase but that was over by the middle of the cold war. It started as an ideal, then become a way to rationalize the USSR's grip on the East, then it died out as countries started to realize they would be better off with the other bloc.
Edit: of course communism had more ideals than internationalism. For example it did not include the authoritarianism part. However they disappeared after it was implemented as a way to rule a country and were replaced by the means that allowed the ruling group to stay in power.
EDIT: more seriously, though, throughout the 20th century America hewed much closer to fascism than communism. It's always been there, if not always out in the open.