What does judicial review at the federal level deal with beyond just laws, statues and bills?

Judicial review not only applies to the Judicial branch's ability to review the actions of the legislative branch but also to the actions of the Executive Branch in the forms of executive agency action or inaction.

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.