Nevertheless, I believe that the more radical forms of anti-Zionism that have emerged with renewed force in recent years do display unmistakable analogies to European anti-Semitism immediately preceding the Holocaust... For example, 'anti-Zionists' who insist on comparing Zionism and the Jews with Hitler and the Third Reich appear unmistakably to be de facto anti-Semites, even if they vehemently deny the fact! ... For if Zionists are 'Nazis' and if Sharon really is Hitler, then it becomes a moral obligation to wage war against Israel. ... Anti-Zionism is ... also the lowest common denominator and the bridge between the Left, the Right, and the militant Muslims; between the elites (including the media) and the masses; between the churches and the mosques; between an increasingly anti-American Europe and an endemically anti-Western Arab-Muslim Middle East; a point of convergence between conservatives and radicals and a connecting link between fathers and sons." Dina Porat (head of the Institute for Study of Antisemitism and Racism at Tel-Aviv University) contends that anti-Zionism is antisemitic because it is discriminatory: ... antisemitism is involved when the belief is articulated that of all the peoples on the globe (including the Palestinians), only the Jews should not have the right to self-determination in a land of their own. Or, to quote noted human rights lawyer David Matas: One form of antisemitism denies access of Jews to goods and services because they are Jewish. Another form of antisemitism denies the right of the Jewish people to exist as a people because they are Jewish. Antizionists distinguish between the two, claiming the first is antisemitism, but the second is not. To the antizionist, the Jew can exist as an individual as long as Jews do not exist as a people. British sociologist David Hirsh wrote a book called "Contemporary Left Antisemitism" in which he studied anti-Zionism empirically. Philosophically, one might privately find under a set of theoretical circumstances that it is possible to be an anti-Zionist without being an antisemite, but according to Hirsh's book, "When anti-Zionism gets a foothold [in an organization] and becomes popular and normal and legitimate, it brings antisemitism with it." According to the December 1969 issue of "Encounter", a student attacked Zionism in the presence of Dr. Martin Luther King, an American civil rights activist.