In the 1930s, after the appointment of Henry J. Anslinger as the commissioner of the newly-established Narcotics Bureau, hemp cannabis was declared a narcotic and hemp farming was banned in the USA.
Ngeminyaka yama 1930s, emveni kokuchongwa kuka Henry J. Anslinger njengo mkomishinala we Narcotics Bureau esandula ukusekwa, ihemp engumya yachazwa njenge siyobisi kwaye ukulima ihemp kwafakwa isibheno kwelase USA.