noun
Refers to the most important person in an organization or activity, often in a criminal or business context. Same meaning as English 'kingpin'.
彼は麻薬組織のキングピンとして知られている。
He is known as the kingpin of the drug cartel.
その会社のキングピンは、創業者である田中氏だ。
The kingpin of that company is its founder, Mr. Tanaka.