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 "International Brotherhood of Teamsters"): Formerly known as the International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America, the IBT is a member of the Change to Win Federation and Canadian Labour Congress.
Relevant evidence: No