The U.S. Treasury said on Thursday it has sanctioned the top leaders of Venezuelan prison gang Tren de Aragua for being involved in criminal activities including illicit drug trade, human trafficking and money laundering.

The group has been linked to human trafficking networks that move migrants north through Central America and Mexico, with stops in border cities like Tapachula and Tijuana - and eventual arrivals in U.

The Treasury Department sanctioned the leader of Tren de Aragua — a kingpin with the Spanish-language nickname of “Warrior Boy” — as part of a crackdown on the vicious Venezuelan prison gang’s illicit drug and human trafficking schemes.