pit boss

Short definition from Wiktionary

Noun

1. 1
   A direct overseer of laborers in a mining operation.
2. 2
   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.
3. 3
   The supervisor of the maintenance pit crew of a driver.
4. 4
   Alternative form of pit boss.