A big part of anarchist ideology is the notion of "solidarity". So if a group were to attempt to assert authority by coercive means like this, then people would

A big part of anarchist ideology is the notion of "solidarity". So if a group were to attempt to assert authority by coercive means like this, then people would ideally come together in solidarity to stop them. This is why anarchists and antifa show up to stop neo-nazis that are threatening minorities and other vulnerable groups.