What are two theories on why the plague began?

Firstly, what plague? Are we talking about the Bubonic plague?

Explanation:

1) By rats, Which served as the vector which spread the disease.

2) Lack of hygiene and them throwing their sewage and was out of their window into the street.

labor leaders and organizations had the power to demand it.

explanation:

workers got a five-day workweek because the bcea protects and respect the rights of the employees. labor leaders and other groups demanded it.