An FBI agent testified on Monday that Chinese nationals brought to the United States under research visas went to work for ZTE Corp. in New Jersey—a possible sign the Chinese tech company violated its probation from a 2017 U.S. plea deal. At a hearing in federal court in Dallas, FBI special agent Marcus Wondergem said Chinese nationals came to the United States under the guise they would be doing research at the lab of Georgia Tech professor Gee-Kung Chang, but spent little time there and moved to apartments near ZTE in Morristown, New Jersey. “Is it true that some of these individuals spent months without entering the lab?” Assistant U.S. Attorney John de la Garza asked Wondergem. “Yes, it is,” Wondergem replied. U.S. District Judge Ed Kinkeade said he hoped to issue a written ruling in a matter of days. ZTE is on probation from its guilty plea in a …