Untitled (striker, Union #1), 1930s.

Photograph by Liborio Justo .

What do they mean, "untitled"? The sign in this photograph of a picket in front of a theatre contains all the title one needs to understand that "This Theatre Does Not Employ Members of Theatrical Protective Union No. 1, Affiliated with the American Federation of Labor"? What could be clearer?

Courtesy Howard Greenberg Gallery, New York City.