A person who believes in or promotes fraternalism, the idea that people should treat each other as brothers and sisters.
From 'fraternalism' plus the suffix '-ist,' denoting an adherent of a belief system. Emerged in 19th-century political discourse.
Fraternalists were activists who organized labor unions, cooperatives, and mutual aid societies based on the radical idea that ordinary workers were brothers and sisters who should support each other instead of competing.
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