The status of unionism among librarians in public and academic libraries, with emphasis on the years 1972 to 1975, is the subject of a report based on a search of the literature. The first section gives an indication of the frequency and mood of comment in the current professional literature. There follows a brief summary of library union development from 1914 through 1970, and more detailed reports on activities in specific libraries from 1970 to 1975. Specific libraries are also targeted in the sections on the agency shop and strikes. Three tables provide data on public library unions without collective bargaining contracts, strikes by library workers (1958-1968), and state anti-strike provisions as of 1972. Suggestions for further study and a bibliography are included. (Author/LS)