ringleader

/หˆษนษชล‹หŒliหdษ™ษน/
noun
  1. 1

    A leader of a group of people, especially an unofficial group.

  2. 2

    A person who starts and leads a disturbance (such as a riot), a conspiracy, or a criminal gang.

    โ€œThe police arrested the ringleaders of the smuggling operation.โ€

Source: https://en.wiktionary.org/wiki/ringleader