Chinese e-commerce company Temu has filed a lawsuit in Boston federal court, accusing rival Shein of violating U.S. antitrust law through its interactions with clothing manufacturers. Temu’s lawsuit alleges that Shein “forces manufacturers to sign loyalty oaths certifying that they will not do business with Temu,” and that Shein impedes “the expansion of the ultrafast fashion market in the United States.” The latest development in the companies’ ongoing legal dispute, comes as another case makes its way through Chicago federal court. In it, Shein has accused Temu of collaborating with influencers to defame Shein on social media. Shein on Monday said Temu’s lawsuit was “without merit and we will vigorously defend ourselves.” Shein is a China-based company, which markets apparel at low prices in the US, Europe, and Asia. It has achieved a valuation of $66 billion. Temu, positioning itself as a provider of even lower prices than Shein, has experienced significant growth, with its gross merchandise value reaching $635 million in May, according to data from YipitData. [Reuters]