Mosab Hassan Yousef is a Palestinian who worked undercover for Israel's internal security service Shin Bet from 1997 to 2007. Shin Bet considered him its most valuable source within the Hamas leadership: the information Yousef supplied prevented dozens of suicide attacks and assassinations of Israelis, exposed numerous Hamas cells, and assisted Israel in hunting down many militants, including his own father, a Hamas leader Sheikh Hassan Yousef. In March 2010, he published his autobiography titled Son of Hamas. (from Wikipedia)

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