• Mexican and Mexican-American organizations:The Texas Mexican Mafia is a significant presence in the region, with members and associates frequently arrested by federal and local law enforcement. Mexican cartels and transnational criminal organizations are also major threats along the border.
• The Dixie Mafia: This was a loose-knit, predominantly white, Southern criminal network that controlled much of Southeast Texas and other parts of the South for decades, involved in activities like illegal gambling, drug trafficking, and corruption.
• Outlaw Motorcycle Clubs: Groups like the Bandidos Motorcycle Club, which originated in Texas, are classified by law enforcement as organized crime syndicates with a worldwide presence.
• White Supremacist Prison Gangs: The Aryan Brotherhood of Texas and the Aryan Circle are white prison gangs that pose a significant threat within the state’s correctional system and on the streets. 

While Irish-American organized crime has a history in U.S. cities like Boston and New York, it was primarily concentrated in the late 19th and early 20th centuries and in specific localized areas, with no established presence in South Texas.