Why was the national industrial recovery act unconstitutional?

Answer 1

Because the phrase "unfair competition" was very vague, and was not properly defined at any point during the Act.

Answer 2

The National Industrial Recovery Act (NIRA) was found to be unconstitutional because it delegated excessive legislative power to the executive branch, violating the separation of powers. The Act allowed the President to create regulations for virtually every industry, thus infringing on Congress's legislative authority. The Supreme Court ruled in 1935 that the NIRA violated the non-delegation doctrine and declared it unconstitutional.