"At the beginning of 1968, the word Palestinian was generally used to refer to members of Arab guerrilla units, which were also frequently referred to in the Western press as terrorist organizations. These groups used the label Palestinian, as in the Palestine Liberation Front, the Palestinian Revolution, the Palestine Revolutionary Youth Movement, the Vanguard for Palestine Liberation, the Palestinian Revolutionaries Front, and the Popular Front for the Liberation of Palestine. At least twenty-six such groups were operating before the 1967 war."