king·pin 
/ˈkɪŋˌpɪn/ noun
plural king·pins /ˈkɪŋˌpɪn/ noun [count] : a person who controls an organization or activity
▪ kingpins of the movie industry ▪ a mob kingpin [=a man who controls a gang of criminals] ▪ a drug kingpin [=a man in charge of a large group of people who sell illegal drugs]
▪ kingpins of the movie industry ▪ a mob kingpin [=a man who controls a gang of criminals] ▪ a drug kingpin [=a man in charge of a large group of people who sell illegal drugs]
