A person who practices or advocates collaborationism, especially someone who worked with or supported an occupying enemy power.
From 'collaborationism' + '-ist' (suffix for a person who practices or believes in something), emerging as a historical term during and after WWII.
After WWII, many collaborationists faced trials and executions, but historians now recognize that 'collaboration' existed on a spectrum—from active Nazi supporters to people simply trying to survive under occupation.
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