Partisans

A partisan is a member of an irregular military force formed to oppose control of an area by a foreign power or by an army of occupation by some kind of insurgent activity.

Irregular military is any non-standard military component that is distinct from a country's national armed forces.

The Unknown War - Ep10 The Partisans by greatworldwar

The term can apply to the field element of resistance movements.

A resistance movement is an organized effort by some portion of the civil population of a country to resist the legally established government or an occupying power and to disrupt civil order and stability.

Yugoslav Partisans during World War II by S&F Production

Most common use in present parlance in several languages refers to anti-fascist fighters from World War II, and more specifically, the Communist or Socialist troops during WW II of Slovakia, Poland, Italy, Hungary, Yugoslavia and Greece.

World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

Led by communist parties, they opposed the occupation and led guerilla warfare against the Nazi and Nazi-allied powers during the Second World War.