01/13/1937
https://www.presidency.ucsb.edu...
"Temporary clerks, carriers, and laborers required for part-time or intermittent work in the Postal Service in connection with the present holiday or seasonal business from this date to February 1, 193..."
"Now, Therefore, I, Franklin D. Roosevelt, President of the United States, pursuant to the authority vested in me by title I of the National Industrial Recovery Act, ... do order that the said code of ..."
"I hereby prescribe the following procedure and delegate the following authority with respect to complaints and investigations under section 3(e) of said title."
"We have a long way to go, but we are on the way."