Migrant gangs are turning Aurora, Colo., apartment complexes into hellholes, and the Democratic governor is turning a blind eye. It’s an unhappy consequence of being a suburb of sanctuary-city Denver: Venezuelan migrants have spread from the Mile High City, with gang-affiliated ones claiming apartment buildings as their turf, terrorizing residents. One chilling video shows suspected Tren de Aragua members stalking through the complex with guns. Another, from the same complex, shows two men breaking into a unit with a tire iron. Mayor Mike Coffman confirmed that at least two buildings have been taken over, calling it an “organized criminal effort,”...