Executive Order 5221—Limitation on Non-Official Employment of Officers or Employees of the American Government
November 11, 1929
It is hereby ordered that no officer or employee in the executive branch of the United States Government, regardless of whether he is on annual leave or leave without pay, shall be employed with or without remuneration by any foreign government, corporation, partnership, or individual that is in competition with American industry.
HERBERT HOOVER
The White House,
November 11, 1929.
Herbert Hoover, Executive Order 5221—Limitation on Non-Official Employment of Officers or Employees of the American Government Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/360918