shot caller

noun2

1. •
   (slang) Someone in charge, especially the leader of a street gang.

   • 'Cause I'm the creepy crawler that be crawling your walls / And I'm the shot caller when it comes to shot calls — 2004
2. •
   (US, slang) A prison inmate who holds informal authority over other inmates and who masterminds criminal activity.

   • […] the CDC's campaign to isolate other "shot callers" in its new generation of super maximum security prisons. — 2000