Boss

From Memory Alpha, the free Star Trek reference.

The boss is a title referenced in the novel "Chicago Mobs of the Twenties".

After this book had become the basis of the culture on Sigma Iotia II in the 22nd century, the term described the men in charge of certain territories on this planet. A boss had to care for the people in his territory as well as for the infrastructure, for which he got a percentage of their money. In 2268, there were about a dozen big bosses on Sigma Iotia II, including Bela Oxmyx and Jojo Krako, and several more smaller ones. (TOS: "A Piece of the Action")