Secret criminal organization originating in Sicily that spread to mainland Italy and the US (5)

I believe the answer is:

mafia

(Other definitions for mafia that I've seen before include "Sicilian criminal organisation" , "Criminal society" , "Italian criminal organisation" , "Criminal organisation also known as Cosa Nostra" , "Group exerting a hidden sinister influence" .)

I've seen this clue in The Mirror.

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