US warns companies about doing business in Hong Kong MATTHEW LEE, AP Diplomatic Writer July 16, 2021 FacebookTwitterEmail People visit the annual book fair in Hong Kong Wednesday, July 14, 2021. Booksellers at Hong Kong's annual book fair are offering a reduced selection of books deemed politically sensitive, as they try to avoid violating a sweeping national security law imposed on the city last year.Matthew Cheng/AP WASHINGTON (AP) — The Biden administration issued a blanket warning Friday to U.S. firms about the risks of doing business in Hong Kong as China continues to clamp down on political and economic freedoms in the territory.