This is a broad assessment of the institutional health of the 28 major national unions in the United States. The membership in the unions and the financial and political resources are examined specifically from 1979 through 1993. The focus on this era is because it contains the 1980s--a time when the unions were assailed from several positions. The fundamental idea in this work is that the resources of the union affect their capacities to undertake a variety of activities, and that the unions have a great deal of institutional strength which is likely to ensure their existence in the future.