During the 1920s and early 1930s, the Rosedale Shoe Factory was able to prevent workers from forming a union by requiring them to sign an employment contract in which they agreed not to join a union as a condition of employment. Rosedale Shoe Factory was making use of
A yellow-dog contract required workers to agree not to join a union as a condition of employment. This type of contract was declared illegal by the Norris-LaGuardia Act in 1932.