The biggest mass arrests under the national security law in Hong Kong took place on Wednesday morning as about 50 former opposition lawmakers and activists were rounded up for their part in a primary election run-off last July.Among the arrested were former lawmakers James To Kun-sun, Lam Cheuk-ting, Andrew Wan Siu-kin, Alvin Yeung Ngok-kiu and Wu Chi-wai, as well as pollster Dr Robert Chung Ting-yiu, who helped organise the event.The Post looks at the controversial democratic primary and why…
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