A temporary guest worker H2-A and H2-B visa program was made an official law as part of the Immigration and Nationality Act (INA) 1
Sources:
- Vernon M. Briggs Jr. “History of Guestworker Programs: Lesson from the Past and the Warnings for the Future,” Center for Immigration Studies, Last modified March 1, 2004, https://cis.org/Report/History-Guestworker-Programs