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ringleader - Someone who is the main influence or motivator behind a particular action or event, especially a disruptive or controversial one.

The police managed to arrest the ringleader of the gang, who had coordinated the series of robberies across the city.
rehabilitate - To renovate or repair something, such as a building, facility, person, or environment, to make it more usable or up to current standards.

The city invested in programs to rehabilitate the old industrial district, transforming it into a vibrant area for businesses and residents.