The Palestine Liberation Organisation (PLO) was formed in 1964 as a counterpoint to Zionism and the establishment of an independent Palestinian State free of the Zionists. This led to an escalation in the conflict between the Arabs and the Jews in Israel and there was a full fledged war in 1967 between Israel on the one hand and Egypt, Syria and Jordan on the other. The Israelis won a comprehensive victory within six days and annexed the Sinai peninsula and the Gaza strip from Egypt, the Golan Heights from the Syrians and the West Bank including East Jerusalem from Jordan and completely occupying Palestine. Subsequently through peace accords the Israelis have given back the occupied territories and the Palestinian State has been established in the Gaza strip and the West Bank with the PLO having given up violence and accepted the existence of Israel and vice versa.
However, a section of the Palestinian Arabs continue to fight against the Israelis, especially the militant organisation Hamas which has vowed to drive the Jews out of Israel. Basically they are against the continuous building of settlements by Israel in the West Bank where the Palestinian State is theoretically sovereign. Overall Israel continues to violate the human and civil rights of Arabs within its territory and in the West Bank and Gaza. Hamas has held sway over the Gaza strip since 2006 or so and continually engages in hostilities with Israel. There have been many skirmishes and battles leading to regular loss of life in the Gaza strip which escalates when there are conflicts like the one that is one going on now. Both the Egyptian and the Israeli Governments are not happy with Hamas and so they have imposed a complete blockade of Gaza not allowing any thing whatsoever, including food to be supplied to the area. Thus, we have two rigid opposing positions - that of Hamas, that they will not stop short of destroying the Israeli State and that of the Israelis, that Hamas has to be finished. Therefore, the war continues and there seems to be no end in sight and neither is there justice for the Palestinian Arabs as a whole as they are globally considerably less powerful than the Zionists.