Mister X (prisoner)

Mister X, also Mr. X and Prisoner X, are placeholder names for a prisoner, who may or may not exist, reportedly being held in Israel for unspecified crimes at Ayalon Prison, a maximum-security prison inRamla. Rumor of his potential existence first surfaced when an Israeli news website (Ynet) briefly posted an article about him, which was allegedly removed because of a gag order.[1][2] These unsubstantiated reports claim that the man is confined in total seclusion, and that he is being housed in the cell that was built for Yigal Amir, the assassin of Yitzhak Rabin.[1][3][4]

The Association for Civil Rights in Israel sent a letter to the Attorney General, Yehuda Weinstein, protesting the conditions of this man’s detention. The chief legal counsel for the Association, Dan Yakir, wrote: "It is insupportable that, in a democratic country, authorities can arrest people in complete secrecy and disappear them from public view without the public even knowing such an arrest took place"[1]

Weinstein's assistant replied that "The current gag order is vital for preventing a serious breach of the state's security, so we can not elaborate about this affair".[5]

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from a comment at reddit:

An article by Richard Spencer and Adrian Blomfield in The Telegraph suggests Mr. X may be being detained for espionage:

One Israeli security expert said that the secrecy suggested espionage rather than terrorism is likely to lie at the heart of the mystery. In 1983, Marcus Klingberg, a leading Israeli scientist, was jailed for 20 years for passing secrets about the country's biological warfare programme to the Soviets. But it was only after he had been in prison for a decade that Israelis heard for the first time about Klingberg's existence, arrest and conviction.