Judith Stepan-Norris and Jasmine Kerrissey have a new book analyzing industry-level union density from 1900-2015, Union Booms and Busts: The Ongoing Fight Over the U.S. Labor Movement (Oxford University Press, June 2023). Everyone is invited to make use of the book’s publicly available data repository, including information on union membership and density, strikes, elections, unfair labor practices, employment size, race, gender, and occupation of workers.