Table 9: Membership in selected unions.

OrganizationThousands of members
195519651975197919811989

Industrial Workers of America (International Union of)7193927860
Machinists and Aerospace Workers (International Association of)627663780664680517
Painters and Allied Trades (International Brotherhood of)182160160160160128
Sheet Metal Workers International (Association)50100120120120108
Roofers, Waterproofers and Allied Workers (United Union of)283123
United Steelworkers of America9808761,062964913481
AFL-CIO (overall)12,62212,91914,07013,62113,60213,556