Fascists are lesser faction but if the society is bitterly splintered, they maneuver their way to power. For example, if a certain country has 2 major parties each supported by ~50% of population and no voter of one party can ever muster to vote for another for any reason, including to protect their future voting itself, then fascists do not need to metastasize to 51% of population, they just need to metastasize to 26%. Adjust to the number of parties as needed.