In 1908, the Bureau of Investigation (BOI, from 1935, the FBI)) was founded by the government to investigate "white slavery" by interviewing brothel employees to discover if they had been kidnapped. Out of 1,106 prostitutes interviewed in one city, six said they were victims of white slavery. The White-Slave Traffic Act (Mann Act) of 1910 prohibited so-called white slavery. It also banned the interstate transportation of women for "immoral purposes". Its primary stated intent was to address prostitution and perceived immorality. The Supreme Court later included consensual debauchery, adultery, and polygamy under "immoral purposes". Prior to World War I, there were few laws criminalizing prostitutes or the act of prostitution.