A person who practices or advocates for exploitation; someone who unfairly uses others or resources for personal profit or advantage.
From 'exploitation' + '-ist' (one who practices/believes in). Combines the noun for unfair use with a suffix creating an agent noun for a person practicing that activity.
Communist philosophers used 'exploitationist' as a political label—Marx's analysis of capitalism rested on the idea that the entire system was built by 'exploitationists' extracting labor value from workers.
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