noun
a person who leads others, especially in unlawful activities or in a group that causes trouble
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The ringleader of the criminal organization was finally apprehended by the authorities.
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Everyone knew that Jake was the ringleader of the group planning the surprise party.
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The ringleader of the gang was known on the streets as 'Big Boss'.
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She was the ringleader of the office gossip, always starting and spreading rumors.