Boyle is a long-standing critic of Israel, Zionism, and American foreign policy towards Israel. In 1986, Boyle filed a lawsuit against Israeli General Amos Yaron for purported involvement in the Sabra and Shatila massacre on behalf of several relatives of victims, but lost when the United States State Department said that Yaron could not be tried due to the diplomatic immunity he enjoyed as a military attaché to the United States. Boyle countered that under the Nuremberg Principles, there are no privileges or immunities for suspected war criminals, but the court decided that since President Ronald Reagan had given Yaron a "formal certification" that "this was a political question and the court could not do anything to the contrary". Boyle has since followed all lawsuits against Israelis internationally, and blames "Zionist control and domination of the American judiciary" for the failure of these lawsuits in the United States. Boyle proposed that the United Nations General Assembly set up the "International Criminal Tribunal for Israel" (ICTI) as a "subsidiary organ" under Article 22 of the United Nations Charter. His suggestion was endorsed in the UN by Malaysia and Iran, and supported by several dozen Arab and Muslim countries.