pit boss

noun3

1. •
   A supervisor who oversees the dealers and activity at the gaming tables in a casino, and who typically has the authority to expel unruly gamblers from the premises.

   • Las Vegas: The pit boss sees all on the casino floor as a trained trouble spotter amid this high-roller’s paradise. — 2007
2. •
   The supervisor of the maintenance pit crew of a driver.
3. •
   (old-fashioned) A direct overseer of laborers in a mining operation.

   • How long could a man expect to stand on the steps of a company building, with a super and a pit-boss at his back, and organise a union of mine-workers? — 1917