The members of the tongs were marginalized, poor, had low educational levels and lacked the opportunities available to wealthier Chinese. Their organizations formed without any clear political motives and soon found themselves involved in lucrative criminal activities, including extortion, gambling, people smuggling, and prostitution. Prostitution proved to be an extremely profitable business for the tongs, due to the high male-to-female ratio among the early immigrants. The tongs would kidnap or purchase females (including babies) from China and smuggle them over the Pacific Ocean to work in brothels and similar establishments. There were constant internecine battles over territory, profits, and women in feuds known as the tong wars, which began in the 1850s and lasted until the 1920s, notably in San Francisco, Cleveland and Los Angeles.