What is "heelers"

Usage examples of "heelers".

In the end, and after much ostentatious opposition on the part of the railroad heelers, Lyman was nominated and subsequently elected.

He had been seventeen years in New York, and now a talk of Tammany and its chances in the next election, of pulls and deals, of bosses and heelers, grew up between the civic step-brothers, and joined them is a common interest.