steerer

noun

1. Someone or something that steers.
2. A person hired by a gambling establishment to locate potential customers and bring them in.

   “It isn't long before the casino help are telling their friends not to patronize the joint, and they in turn tell their friends, and in a very short time hundreds of people know all about it. At this point, the only way to get action is to hire a flock of steerers […]”