This article analyzes what happened to independent local unions (ILUs), also known as company unions, since 1935. After providing a statistical analysis of ILU membership since 1935, the article looks at the factors that shaped membership trends: changes in labor law, the characteristics of ILUs, worker attitudes toward ILUs, and employers' industrial relations policies. New evidence is presented that suggests that even those employers who still favored ILUs in the 1950s were orienting them away from collective bargaining and toward the “new nonunion model” of the 1960s and 1970s.