I offer my condolences to our nation, especially to the relatives of those who lost their lives. - Fethullah Gülen

The next day, the government produced lists of thousands of individuals whom they tied to Hizmet — for opening a bank account, teaching at a school or reporting for a newspaper — and treated such an affiliation as a crime and began destroying their lives. The lists included people who had been dead for months and people who had been serving at NATO’s European headquarters at the time. International watchdogs have reported numerous abductions, in addition to torture and deaths in detention. The government pursued innocent people outside Turkey, pressuring Malaysia, for instance, to deport three Hizmet sympathizers last week, including a school principal who has lived there for more than a decade, to face certain imprisonment and likely torture.

In April, the president won a narrow referendum victory — amid allegations of serious fraud — to form an “executive presidency” without checks and balances, enabling him to control all three branches of the government. To be sure, through purges and corruption, much of this power was already in his hands. I fear for the Turkish people as they enter this new stage of authoritarianism.

Like many Turkish citizens, the Hizmet movement’s participants supported Mr. Erdogan’s early efforts to democratize Turkey and fulfill the requirements for membership in the European Union. But we were not silent as he turned from democracy to despotism. Even before these new purges, Mr. Erdogan in recent years has arbitrarily closed newspapers; removed thousands of judges, prosecutors, police officers and civil servants from their positions; and taken especially harsh measures against Kurdish communities. He has declared his detractors enemies of the state.