RINGLEADER

ringleader. Ringleader, n. the head of a mob or in mischief

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Ring″lead′er (?), n. 1. 1. The leader of a circle of dancers; hence, the leader of a number of persons acting together; the leader of a herd of animals.
A primacy of order, such an one as the ringleader hath in a dance. Barrow. 2. 2. Opprobriously, a leader of a body of men engaged in the violation of law or in an illegal enterprise, as rioters, mutineers, or the like.
The ringleaders were apprehended, tried, fined, and imprisoned. Macaulay.