South Central Primera Flats 23 The South Central Primera Flats 23, also known as the "First Flats" or "First Street Flats", are a long standing Mexican American street gang active in South Los Santos, San Andreas. The gang was formed in the late 1940s. Some of the gang’s first shotcallers went on to join the Mexican Mafia in the 1950s, which began a strong partnership that still exists today.    Aliso Village Era "Primera" is the Spanish word for “First”, which represents the