The Hatch Act of 1939 aimed at corrupt political practices, prevented federal civil servants[?] from campaigning.
See also: Pendleton Civil Service Reform Act
... Scheckter, (South Africa) 1980 - Carlos Reutemann[?], (Argentina) 1981 - Gilles Villeneuve, (Canada) 1982 - Riccardo Patrese, (Italy) 1983 - Keke Rosberg, ...