The Hip Sing Association or HSA, formerly known as the Hip Sing Tong, is a Chinese-American criminal organization/gang formed as a labor organization in New York City's Chinatown during the early 20th century (perhaps c. 1904). The Cantonese name "Hip Sing" (協勝) translates roughly to "cooperating for success." The Hip Sing Tong, along with their rivals the Four Brothers and the On Leong Tong, would be involved in violent Tong wars for control of Chinatown during the early 1900s. During the 1930s and 1940s, the Hip Sings were involved in drug trafficking operations with the Kuomintang (KMT) and later the Office of Policy Coordination (OPC). They would later establish chapters in Chinese-American communities throughout the United States in major cities such as Chicago, Seattle and San Francisco (the latter being subject to a major drug raid by authorities in 1996). Recently some branches have begun to transform back into the legitimate fraternal organization they started as over a century prior.