How a factory city in Wisconsin fed military-grade weapons to a Mexican cartel

Racine, Wisconsin is best known for factories, farming, and an extravagant televised prom celebration.

But in 2018, Racine’s suburban sprawl on the edge of Lake Michigan became a source of high caliber weapons for one of Mexico’s top fentanyl trafficking gangs, the Cartel Jalisco Nueva Generacion (CJNG), U.S. federal arms-trafficking investigators allege.

The cartel exploited permissive federal and state-level gun control rules to buy some of the most powerful weapons available to American civilians, according to two former agents with the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)...