Johnson initially criticised Facebook as being unhelpful during a 10-month investigation by his department.
Police in Chicago said on Thursday they have arrested 50 people suspected of using "secret groups" on Facebook to deal in guns and drugs, and have teamed up with the world's largest social media network to crack down on criminal trafficking online.
Announcing the arrests at a news conference, Police Superintendent Eddie Johnson initially criticised Facebook as being unhelpful during a 10-month investigation by his department.
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