Nation 4 indicted in connection to tractor-trailer smuggling operation that left 53 dead in San Antonio July 21, 2022July 21, 2022 Celina Tebor, USA TODAY Comments Off on 4 indicted in connection to tractor-trailer smuggling operation that left 53 dead in San Antonio The incident is the deadliest known migrant smuggling attempt in U.S. history, where 53 people were found dead inside an abandoned tractor-trailer.