The directive was among 403 pages of internal documents that have been shared with The New York Times in one of the most significant leaks of government papers from inside China’s ruling Communist Party in decades. They provide an unprecedented inside view of the continuing clampdown in Xinjiang, in which the authorities have corralled as many as a million ethnic Uighurs, Kazakhs and others into internment camps and prisons over the past three years.

Read the Full Document: What Chinese Officials Told Children Whose Families Were Put in Camps

The party has rejected international criticism of the camps and described them as job-training centers that use mild methods to fight Islamic extremism. But the documents confirm the coercive nature of the crackdown in the words and orders of the very officials who conceived and orchestrated it.

ven as the government presented its efforts in Xinjiang to the public as benevolent and unexceptional, it discussed and organized a ruthless and extraordinary campaign in these internal communications. Senior party leaders are recorded ordering drastic and urgent action against extremist violence, including the mass detentions, and discussing the consequences with cool detachment.

Children saw their parents taken away, students wondered who would pay their tuition and crops could not be planted or harvested for lack of manpower, the reports noted. Yet officials were directed to tell people who complained to be grateful for the Communist Party’s help and stay quiet.

The leaked papers offer a striking picture of how the hidden machinery of the Chinese state carried out the country’s most far-reaching internment campaign since the Mao era. The key disclosures in the documents include:

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President Xi Jinping, the party chief, laid the groundwork for the crackdown in a series of speeches delivered in private to officials during and after a visit to Xinjiang in April 2014, just weeks after Uighur militants stabbed more than 150 people at a train station, killing 31. Mr. Xi called for an all-out “struggle against terrorism, infiltration and separatism” using the “organs of dictatorship,” and showing “absolutely no mercy.”