Anti-fascism is opposition to fascist ideologies, groups and individuals. The anti-fascist movement began in a few European countries in the 1920s, and eventually spread to other countries around the world. It was at its most significant shortly before and during World War II, where the fascist Axis powers were opposed by many countries forming the Allies of World War II and dozens of resistance movements worldwide. Anti-fascism has been an element of movements holding many different political positions, including social democratic, nationalist, liberal, conservative, communist, Marxist, trade unionist, anarchist, socialist, pacifist and centrist viewpoints.

https://en.wikipedia.org/wiki/Anti-fascism