This is the best summary I could come up with:

The Hamas leader Yahya Sinwar has for years overseen a secret police force in Gaza that conducted surveillance on everyday Palestinians and built files on young people, journalists and those who questioned the government, according to intelligence officials and a trove of internal documents reviewed by The New York Times.

But a 62-slide presentation on the activities of the General Security Service, delivered only weeks before the Oct. 7 attack on Israel, reveals the degree to which the largely unknown unit penetrated the lives of Palestinians.

Those people recounted key events, confirmed biographical information and, in Mr. Fasfous’s case, described interactions with the authorities that aligned with the secret files.

One Palestinian individual familiar with the inner workings of Hamas, who spoke on the condition of anonymity because of the sensitivity of the matter, confirmed that the service was one of three powerful internal security bodies in Gaza.

“This General Security Service is just like the Stasi of East Germany,” said Michael Milshtein, a former Israeli military intelligence officer specializing in Palestinian affairs.

An October 2016 report described young men and women performing unspecified “immoral acts” at a Palestine Liberation Organization office in Khan Younis at night.

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