Tanzim (Organization in Arabic) is a faction of the Palestinian al-Fatah movement. It is seen as a more militant "new guard" within Fatah, as opposed to the "old guard" which supported the Oslo "peace process". Tanzim came to prominance in the riots and street fighting which marked the beginning of the second Palestinian Intifada. Its members tend to be younger than those of other Fatah factions, often having grown up in the post-Oslo era. One of its leaders is Marwan Barghouti. Many Tanzim members have joined the al-Shaid Yasser Arafat Brigades (formerly the al Aqsa Martyrs' Brigades).