Construction Workers Union

From Memory Alpha, the free Star Trek reference.

The Construction Workers Union was a union in the USA in the mid-20th century.

Sal and Carmine worked as delegates for the Construction Workers Union in the New York City of the 1940s, though they also worked as loan sharks.

In an alternate timeline, Sal and Carmine turned from working for this union to resistance fighters against the German occupation of New York. (ENT: "Storm Front")