HONOLULU (AP) — A federal judge in Hawaii on Friday dismissed human trafficking charges against executives and business associates of a labor recruiting company accused of exploiting hundreds of farmer workers from Thailand by putting them into debt, confiscating their passports and threatening to deport them.

Authorities accused Los Angeles-based Global Horizons Manpower Inc. of manipulating 600 Thai workers placed in farms across the United States. It was the U.S. government’s largest-ever human trafficking case.