Casseur (n.) is a rioter as described by someone who wants the march itself cleared of blame.
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Casseur (n.) is the word a government reaches for when the protest needs a villain who is not the protester.
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Casseur (n.) is whoever breaks the window; the argument is always about who got him there.
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Casseur (n.) is a hooligan to the police, an infiltrator to the organizers, and a minor to the court.
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Casseur (n.) is a masked man who arrives at the end of every march and in the first line of every report.