Federal authorities have arrested more than 1,100 people since February as part of an enforcement campaign against gangs that traffic guns, drugs and people across United States borders, officials said.

The gangs caught in the dragnet were not small-time operators, said Sarah Rodriguez, a spokeswoman for Immigration and Customs Enforcement.

“We are talking about sophisticated organizations who are involved in human trafficking, who are involved in drug smuggling, gun smuggling,” she said.

Of the 1,133 people arrested during the five-week operation, more than 900 were members or associates of gangs, including MS-13, the Sureños, the Norteños, the Bloods and several others based in prisons, the immigration agency said in a statement.