Belonging to a group makes you feel empowered. Be wary about getting carried away by extreme views. When someone proposes unethical action, bow out. Participating even in a minimal way could destroy your reputation. It's fine to be passionate about an issue, but getting involved with criminal or unethical behaviour crosses a line. When in doubt, obey your conscience. It has never let you down. If certain friendships fall apart resulting from this defection, so be it. You're better off on your own.