WASHINGTON — The United States has placed a unit of the Chinese e-commerce giant Alibaba back on its blacklist of notorious marketplaces known for selling counterfeit goods and violations of intellectual property rights.

The move, taken by the office of the United States Trade Representative on Wednesday, came after American and international trade groups said that Alibaba’s Taobao marketplace was not doing enough to police sales of fakes and pirated apparel and luxury goods.

Being blacklisted does not carry any penalties, but it is a blow to Alibaba, which has been working to shed perceptions that its websites are riddled with fakes. The company is trying to gain more international customers.

Michael Evans, Alibaba group president, said that the company was “very disappointed” to be put back on the list, and that Alibaba was far more advanced in protecting intellectual property rights than it was four years ago. He added that the decision ignored Alibaba’s work to remove more than twice the number of product listings this year than in 2015.