Companies in the U.S. are scrambling to understand their compliance responsibilities in the wake of the Commerce Department’s announcement last week that it was adding Huawei Technologies Co. Ltd and nearly 70 of its affiliates in 26 countries to a trade blacklist.

“We’re fielding literally dozens of calls on the topic of compliance,” Rich Matheny, a partner in Goodwin Procter’s Washington, D.C. office who heads the firm’s global trade practice, said on Tuesday.