It's not that wild when you read history about US government actions towards foreign/domestic organisations/individuals they deem have strayed to a point of challenging the status quo. The most obvious example is looking at how communism was treated post WW2. This I find amazing, not that I support communism, but that the government was so ready to act this way towards someones political choice, regardless of what that is. That's far from upholding democratic values.
So feeling this is a likely monitoring point seems a reasonable statement to me especially on any serious anti-authoritarian activity. As for evidence, that's always going to be a hard one, whether its happening or not.