The government is stepping up scrutiny of members of the civil service and military for signs of misplaced allegiances.

Taiwan has recently renewed an effort to purge its ranks of Chinese sympathizers, indicting four people on Tuesday suspected of spying for China that had infiltrated the presidential office.

Protective measures are to be implemented this month in the Information, Communications and Electronic Force Command, ...

Photo Illustration: WSJ TAIPEI—Taiwan has embarked on a mission to purge any allies of Beijing from its civil service in an escalating battle against China’s influence—vetting hundreds of ...