In World War II, many governments, organizations and individuals collaborated with the Axis powers, "out of conviction, desperation, or under coercion." Nationalists sometimes welcomed German or Italian troops they believed would liberate their countries from colonization. The Danish, Belgian and Vichy French governments attempted to appease and bargain with the invaders in hopes of mitigating harm to their citizens and economies.

The Flemish Movement is an umbrella term which encompasses various political groups in the Belgian region of Flanders and, less commonly, in French Flanders. Ideologically, it encompasses groups which have sought to promote Flemish culture and the Dutch language as well as those seeking greater political autonomy for Flanders within Belgium. It also encompassed nationalists who seek the secession of Flanders from Belgium, either through outright independence or unification with the Netherlands.