The guerrilla bands became known as the Black Hand ( '' al-kaff al-aswad '' ) , an anti-Zionist and anti-British militant organization . The idea for such a group appeared to have crystallized after the 1929 riots . From the outset , a split occurred in the movement . One faction led by Abu Ibrahim al-Kabir argued for immediate attacks against British and Jewish targets , while the other faction , headed by al-Qassam , thought than an armed revolt was premature and risked exposing the group 's preparations . According to Subhi Yasin , a comrade of al-Qassam , the group 's attacks in the north were executed by Abu Ibrahim 's group in defiance of al-Qassam , though in 1969 , Abu Ibrahim denied this allegation . The Black Hand 's ensuing campaign began with the ambush and killing of three members of Kibbutz Yagur on 11 April 1931 , a failed bomb attack on outlying Jewish homes in Haifa in early 1932 , and several operations that killed or wounded four members of northern Jewish settlements . The campaign climaxed with the deaths of a Jewish father and son in Nahalal , from a bomb thrown into their home , on 22 December 1932
1929 riots
1929 Palestine riots
Izz ad-Din al-Qassam