Americans spent a huge amount of money on a war that did not exist and wasn't going to. And Americans got a taste of communism themselves with McCarthyism. The McCarthy hearings and the resultant...
If I understand the question correctly, then; Communism rejects all forms of government in favour of mass participatory democracy (autonomously organised i.e not by a state)
Haha, it's definitely not a threat to a capitalist society. Real communism has failed almost everywhere (i.e. Russia), but do some research into China's government system. We call them communist, but...