Labor unions were certain to advocate for the best interests of workers because

Labor unions were certain to advocate for the best interests of workers because the labor unions were created by workers and made up of workers.
The workers were the ones who had to fight for their own rights because nobody else wanted to.

Rube Goldberg (1883-1970) was a Pulitzer Prize winning cartoonist best known for his zany invention cartoons. He was born in San Francisco on the 4th of July, 1883 – and graduated from U. Cal Berkeley with a degree in engineering. His first job at the San Francisco Chronicle led to early success, but it wasn’t until he moved to NYC and began working for Hearst publications that he became a household name. Rube Goldberg is the only person ever to be listed in the Merriam Webster Dictionary as an adjective. It’s estimated that he did a staggering 50,000 cartoons in his lifetime.