How many employees does it take for the Fair Labor Act to be applied?

The Fair Labor Standards Act (FLSA) applies to all employers engaged in interstate commerce, regardless of the number of employees. This means that even a single employee working in an enterprise that affects commerce is covered under the FLSA provisions. This broad applicability ensures that minimum wage, overtime pay, and child labor laws are uniformly enforced to protect workers.

In the context of the other options, the law does not set a minimum threshold of 5, 10, or 20 employees for its application. The focus is instead on the nature of the work and the involvement in interstate commerce, rather than the size of the workforce. Therefore, the correct answer reflects the fundamental premise of the FLSA — that it protects even one employee in covered businesses.