Relax. Even if there is such a law it certainly is not illegal in USA to "advocate (...) opinions (...) in public". See what happened last time someone thought

Relax. Even if there is such a law it certainly is not illegal in USA to "advocate (...) opinions (...) in public". See what happened last time someone thought advocating opinions was illegal [1]... [1] https://en.wikipedia.org/wiki/Citizens_United_v._FEC https://en.wikipedia.org/wiki/Citizens_United_v._FEC