Question: What is this labor union in North America that had over a million members in 2013 and also worked with the insurance agency owner, and consultant Allen Dorfman?
Sentence (from "Allen Dorfman"): Allen Dorfman (January 6, 1923, Detroit, Michigan – January 20, 1983, Lincolnwood, Illinois) was an insurance agency owner, and a consultant to the International Brotherhood of Teamsters (IBT) Central States Pension Fund.
Relevant evidence: Yes