The Popular Front for the Liberation of Palestine ( PFLP ) ( Arabic : الجبهة الشعبية لتحرير فلسطين, al-Jabhah al-Sha`biyyah li-Taḥrīr Filasṭīn ) is a Palestinian Marxist national liberation movement , founded in 1967. It is considered a terrorist organization by more than 30 countries including the U.S. , European Union