"At the heart of political turmoil in the region and particularly in Jordan, the country with the largest number of registered refugees, is the Right of Return. Since their expulsion in 1948 Israel has denied Palestinians the right to return to their homes and lands"

http://www.forcedmigration.org/guides/fmo025/fmo025.pdf

"Israel's admission to the UN was conditional on its acceptance of UN resolutions including 194. Denying the right of Palestinian refugees to return to their homes and lands is a war crime and an act of aggression which deserves action by the international community. The international community can apply sanctions on Israel until it complies with international law."

http://www.al-awda.org/facts.html