You get rid of the fascists by dismantling the systemic structures that allows them to obtain power of authority over others. You do that by educating others and getting them to disobey the current system in favor of something new.

The entire basis of authoritarian power is people “just following orders” of the established authority. If the fascists can’t obtain systemic power of authority to order others around in the first place then they have no ability to engage in their systemic oppression because those who they try to dictate the actions of will be empowered to tell them to go fuck themselves.