Anti-fascist
Opposes fascism, Nazism, supremacism, and authoritarianism.

Real life anti-fascists include the Allies, the Resistance movements, and the Righteous Among the Nations in World War II. Fictional anti-fascists include the Rebel Alliance, the Inglourious Basterds, and Captain America.
If the other side is fascist, we're all anti-fascist now.