Alarmed by reports of cyberattacks and the growing threat China poses to national security, the United States Congress passed a law in 2018 that would ban any facility operated by the U.S. government or one of its contractors from using equipment made by five state-backed Chinese technology firms: Huawei, ZTE, Dahua, Hytera and a company called Hikvision, the world’s biggest maker of security and video surveillance cameras. According to the National Defense Authorization Act, all U.S. gover