Taiwan has launched a crackdown on holders of illegal Chinese identity documents, revoking the Taiwanese status of more than 20 people and putting tens of thousands of Chinese-born residents under scrutiny.

Under Taiwan law it is illegal for Taiwanese people to hold Chinese identity documents. In the past decade, hundreds of people have had their Taiwanese papers or passports cancelled for also holding Chinese ID, effectively revoking their citizenship.

But a renewed hunt for dual ID-holders has drawn controversy after the public expulsion of three women and threats to the permanent residencies of more than 10,000 Chinese-born people, including many who had built lives and families in Taiwan over decades.

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