Gaidi was sentenced to two life terms in Israel in 1986. (The article says he was sentenced to 4 life terms.)
He claims to have been behind the murders of three Israelis. I could only confirm two of the victims.
One was Haim Azran, 32, a resident of Ashkelon who was stabbed as he shopped in a market in Gaza in September 1986. Yasir Arafat's Force 17 took credit at the time for that attack.
Yisrael Kitaro was a 43-year old taxi driver also from Ashkelon, was similarly stabbed to death in Gaza in October 1986 as he took his car to a garage for repairs.
Gaidi, who is now a member of Islamic Jihad, claims to also have killed another man, Abraham Abu Ghosh.
Gaidi now brags that it only cost three shekels to buy the knife that killed three Israelis.
He called on Fatah to stop negotiations, saying the "the enemy only understands the language of force and Jihad."
