Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: The relevant sentence in the passage is: The National Labor Union (NLU), founded in 1866, was the first national labor federation in the United States.
The question and answer:
The National Labor Union (NLU), founded in 1866, was the first national labor federation in the United States. It was dissolved in 1872.

Based on this passage, in 1866 the first attempt in the united states at a union for workers was called the?
The answer is The National Labor Union