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A loosely aligned group of misfits at [Columbine High School] in the time of the [Columbine] Shootings. Eric Harris and Dylan Klebold were members of the Threnchcoat Mafia. Harris and Klebold had advocated 'killing jocks' but ended up [doing something] wrong instead. 'Trenchcoat Mafia' now indicates any similar group of losers with a patina of simmering menace.
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