6. Kurdistan Worker's Party Best known as PKK, this group was established on November 27, 1978 in Turkey and since then it has been fighting for the sake of an independent Kurdish state. Face of an international terror, PKK's working region constitutes Turkey, Iran, Syria and Iraq and it is also enlisted by a number of counter-terrorism agencies as a deadly international organization. It is led by Cemil Bayik and Abdullah Öcalan.