So, anyone think Communism is a threat to us now? How about the other isms and belief systems?
I consider the bigger threat to be the mass ignorance that leads to Communism constantly being invoked by people who barely know the first thing about it.
The thing to do about communism is the same thing to "do" about anything. It's simple: Educate objectively, discuss openly, analyze critically, and act individually in accordance with that which most makes sense to you, and is most representative of your values. As Jefferson said, the first and only real line of defense against tyranny and abuse of any kind is a well educated public exercising their right to vote.