When Chinese tennis star Peng Shuai took to the Chinese social media site Weibo last month to accuse former Vice Premier Zhang Gaoli of sexually assaulting her, her post disappeared moments later — as did Ms. Peng.

Her disappearance has captured the world’s attention and drawn a swift and principled reaction from the international Women’s Tennis Association (WTA). Where so many American institutions have caved on their self-proclaimed progressive values in the face of Chinese government pressure, the WTA, headquartered in Florida, has stood firm, offering an admirable example of truly ethical leadership.

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