WASHINGTON (AP) — The Justice Department on Thursday announced the arrests of three people in a complex stolen identity scheme that officials say generates enormous proceeds for the North Korean government, including for its weapons program.

The scheme involves thousands of North Korean information technology workers who prosecutors say are dispatched by the government to live abroad and who rely on the stolen identities of Americas to obtain remote employment at U.S.-based Fortune 500 companies, jobs that give them access to sensitive corporate data and lucrative paychecks.

The fraud is a way for heavily sanctioned North Korea, which is cut off from the U.S. financial system, to take advantage of a “toxic brew” of converging factors, including high-tech labor shortage in the U.S. and the proliferation of remote telework, Marshall Miller, the Justice Department’s principal associate deputy attorney general, said in an interview.