The concept of separation of powers was included in the constitution to prevent

The separation of powers was included to prevent the branches from having more power over each other, it provides a system of shared power.

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.