ISTANBUL — A year ago, the journalist Nedim Sener was investigating a murky terrorist network that prosecutors maintain was plotting to overthrow Turkey’s Muslim-inspired government. Today, Mr. Sener stands accused of being part of that plot, jailed in what human rights groups call a political purge of the governing party’s critics.

Mr. Sener, who has spent nearly 20 years exposing government corruption, is among 13 defendants who appeared in state court this week at the imposing Palace of Justice in Istanbul on a variety of charges related to abetting a terrorist organization.

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