Tanzim ( ', "The Organization") was a militant faction of the Palestinian Fatah movement.
Formerly led by Marwan Barghouti, who is serving life sentences for murder in Israel, it had gained prominence during the Second Intifada. Tanzim operateed at the community level and had significantly pulled Palestinian support from Islamist groups. It had participated in violent acts against both military and civilian targets, and some of its members had even conducted suicide bombings.
The Tanzim militia, founded in 1995 by Yasser Arafat and other Fatah leaders to counter Palestinian Islamism, was widely considered to be an armed offshoot of Fatah with its own leadership structure. The acknowledged head of the Tanzim was Marwan Barghouti, who (as of 2017) is serving five consecutive life sentences in Israel for murder.
The Tanzim was a grass roots organization that operates at the community level. By taking a hardline position against Israel, it had helped siphoned/diverted Palestinian support from the Islamist groups to the Palestinian Authority and PLO leadership.
Tanzim had come to prominence in the street fighting which marked the beginning of the second Palestinian Intifada. Its members tended to be younger than those of other Fatah factions, often having grown up in the post-Oslo era. Many Tanzim members had joined the al-Shaid Yasser Arafat Brigades (also known as the al Aqsa Martyrs' Brigades). Tanzim had also recruited female suicide bombers, including Andaleeb Takatka, a 20-year-old Bethlehem woman who had detonated an explosive belt at a Jerusalem bus stop in April 2002, which had killed six Israeli civilians, and injured sixty. Marwan Barghouti, who was widely described as heading Tanzim, explicitly condemned terror attacks within Israel, writing "While I, and the Fatah movement to which I belong, strongly oppose attacks and the targeting of civilians inside Israel, our future neighbour, I reserve the right to protect myself, to resist the Israeli occupation of my country and to fight for my freedom."
At the beginning of the Second Intifada, Hussein Abayat, leader of Tanzim in Beit Sahur, was killed in a helicopter attack by the IDF on 9 November 2000. The operation is considered the first time that Israel publicly acknowledged conducting a targeted killing. Abayat's assistant Khaled Salahat was severely wounded in the strike.
On 15 February 2015, the Israeli army arrested Jamal Abu Lel, charging that he was "the head of" the Tanzim "terrorist organization", running it from the Qalandiya refugee camp while carrying an Israeli permanent resident identity card due to his residing in Kfar Aqab, on the other side of the Jerusalem Airport from Qalandiya. Abu Lel is accused by the Shin Bet of funding and directing terrorist and shooting attacks against Israelis.
Fatah Tanzim have conducted a number of attacks against Israeli targets in the West Bank. Below is a partial list of attacks: