BEIJING, Dec 31 (Reuters) - China"s anti-graft agency on Friday accused U.S. retail giant Walmart Inc (WMT.N) and its Sam"s Club chain of "stupidity and shorted-sightedness" after Chinese news outlets reported Sam"s Club had removed Xinjiang-sourced products from stores. Last week, Sam"s Club came under fire in China after several news outlets shared videos and screenshots on the Weibo social media platform that they said showed products from the far-western Chinese region of Xinjiang had been removed from the store"s online app. The social media row erupted after U.S. President Joe Biden signed into law on Dec. 23 legislation banning imports from Xinjiang over concern about forced labour there. read more Walmart is the latest foreign firm to be tripped up by Western pressure over Beijing"s treatment of Uyghurs and other minority Muslims in Xinjiang and China"s importance as a market and supply base. China rejects accusations of forced labour or any other abuses in Xinjiang. Neither Walmart nor Sam"s Club has made public statements on the backlash against them in China, and Walmart did not respond to a request for comment on Friday. The ruling Communist Party"s Central Commission for Discipline Inspection (CCDI) accused Sam"s Club of boycotting Xinjiang products and trying to "muddle through" the controversy by remaining silent. "To take down all products from a region without a valid reason hides an ulterior motive, reveals stupidity and short-sightedness, and will surely have its own bad consequences," it said on its website. China is a huge market for Walmart, which generated revenue of $11.43 billion in the country during its fiscal year that ended Jan. 31. Of 423 retail units Walmart operates in China, 36 are Sam"s Club stores, according to its website. A search for popular Xinjiang goods like raisins on the Sam"s Club China store app did not yield any relevant results, but neither did searches for products from other places, such as Fujian tea, according to a Reuters review on Wednesday. OUT OF STOCK? Chinese media outlets have cited Sam"s Club customer service representatives explaining that the products were not removed but rather out of stock. The CCDI on Friday called that a "self-deceptive excuse" and said the chain should respect China"s position on Xinjiang if it wanted to "stand firm in the Chinese market". It is not unusual for a foreign brand to be targeted by Chinese social media users or official outlets, and the impact can be damaging. Earlier this week, the Weibo hashtag "Sam"s Club card cancellation" went viral, with over 470 million hits. On Friday, the state-run China Daily newspaper reported that domestic rivals had organised campaigns to promote goods from Xinjiang. In July, Swedish fashion retailer H&M (HMb.ST) reported a 23% drop in local currency sales in China for its March-May quarter after it was hit by a consumer boycott in March for stating publicly that it did not source products from Xinjiang. read more This month, U.S. chipmaker Intel faced similar calls after telling its suppliers not to source products or labour from Xinjiang, prompting it to apologise for "the trouble caused to our respected Chinese customers, partners and the public". read more On Friday, CCDI accused H&M, Intel, and Sam"s Club of collaborating with "western anti-China forces" to destabilise Xinjiang by suppressing and boycotting products from the region. "These Western companies, which once boasted that they were free from political interference, have slapped themselves in the face with their own actions."