The Palestinian Prisoners’ Movement, the political organization of Palestinian prisoners and detainees in Israeli facilities, was once a unified movement where members of all Palestinian political factions cooperated on resistance activities. This unity was shattered in 2007 when clashes between Hamas and Fatah armed wings led to deaths and, subsequently, division between the West Bank and Gaza. Hamas and Fatah members, who once lived together in integrated wings, physically divided into separate sections. They developed separate internal governments and representatives to the prison authorities. Prison leaders’ attempts to reunify were rebuffed by outside political forces. This paper will look at the political and sociological drivers behind the separation, including competition over organizational leadership, as well as and divergent lifestyles. It will then briefly raise questions about the implications of the separation for collective resistance through a brief examination of subsequent collective resistance activities, including prisoners' unified refusal to wear orange uniforms, in 2008, and a 2012 hunger strike led primarily by one faction alone.  Fieldwork for this research was toward a PhD thesis from the Queen's University of Belfast, Northern Ireland (forthcoming). The work explores how prisoners have understood their resistance, how Israeli authorities have attempted to counter it, and how the Palestinian political conditions, such as the creation of the Palestinian Authority and the rise of Islamic political parties, have both influenced and been influenced by the prisoners’ community. It is informed by themes developed in the criminological, social-psychological and sociological literature on resistance as well as a number of key international studies on politically-motivated prisoners’ communities. It uses the rich ethnographic and sociological work available on Palestinian politics and society to understand how prisoners’ resistance has evolved, reflected and shaped Palestinian resistance. Research utilized three types of data gathered over fieldwork in the West Bank conducted in 2014 and 2015: (1) over 40 recorded semi-structured interviews with released prisoners, lawyers, and leaders of prisoners’ defense organizations and dozens of informal or off-record discussions, conducted in both English and Arabic; (2) attendance at events such as demonstrations; and (3) Arabic-language first-person accounts of imprisonment, and published such as publications from Addameer, and academic theses available at the Abu Jihad Prisoners’ Library.