The Federal Communications Commission (FCC) said on March 17 it has begun efforts to revoke authorization for China Unicom Americas, Pacific Networks and its wholly-owned subsidiary ComNet to provide U.S. telecommunications services. In April, the U.S. telecom regulator issued show-cause orders warning it might revoke the operating licenses of three state-controlled Chinese telecommunications companies—the two cited on Wednesday and China Telecom Corp Ltd. China Unicom Americas has a two-decade-old authorization to provide U.S. international telecommunications services. The carriers did not immediately respond to requests for comment. The FCC said Wednesday the companies “have failed at this stage to dispel serious concerns” about their U.S. authorizations. The regulator opened a similar proceeding in December to begin revoking the authorization of China Telecom, the largest Chinese telecommunications company, which has had U.S. authorization for nearly 20 years. FCC Commissioner Geoffrey Starks noted many Chinese telecom carriers “also own data centers operating within …