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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.
refurbish - To clean, repair, or renovate something, especially furniture or buildings, in order to make it look new or improve its functionality.

The hotel decided to refurbish its rooms, replacing old furniture and updating the décor to attract more guests.