Abstract An active member of the labor movement, Max Weinrib served on the Ad Hoc Committee for Marion Ciepley and Irwin Rappaport, two members who were expelled from the International Association for Machinists (IAM) Tool and Die Makers Lodge 113. Mr. Weinrib’s papers relate to the factionalism within Local 113 and the resulting expulsion of Mr. Ciepley and Mr. Rappaport.