Federal and local law enforcement agencies announced the indictments of 30 people in Colorado on Monday, including alleged leaders of the Venezuelan prison gang Tren de Aragua, which a police chief described as akin to a parasite.

Officials described the investigation leading to the operation as the biggest in the country.

"We learned how violent they are," Aurora Police Department Chief Todd Chamberlain said of the gang, which has gained a foothold in metro Denver. "We learned what their mission was. Their mission was to be like a parasite, and they basically take over any area that they can control."

The U.S. Department of Justice, along with the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Drug Enforcement Administration, U.S. Customs and Immigration Enforcement, and the

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