Question

which of the following was one of the earliest labor unions in america?
the electrical workers bureau
united auto workers
the knights of labor

Explanation:

The Knights of Labor was founded in 1869 and was one of the earliest labor unions in America. It aimed to improve working conditions, advocate for workers' rights, and promote a more equitable society. The Electrical Workers Bureau and United Auto Workers were formed much later.

Answer:

the Knights of Labor