While in America, Kook led a group of Irgun activists under the pseudonym "Peter Bergson." The name "Bergson Group" or "Bergsonites" eventually became used to refer to all the members of Kook's immediate circle. The Bergson Group was composed of a hard-core cadre of ten Irgun activists from Europe, America and Palestine, including Aryeh Ben-Eliezer, Yitzhak Ben-Ami, Alexander Rafaeli, Shmuel Merlin, and Eri Jabotinsky. The Bergson Group was closely involved with various Jewish and Zionist advocacy groups, such as the American Friends for a Jewish Palestine and the Organizing Committee of Illegal Immigration. The group also founded some separate initiatives of its own, specifically the Committee for a Jewish Army of Stateless and Palestinian Jews, whose goal was the formation of an Allied fighting force of stateless and Palestinian Jews. Some credit the later formation of the Jewish Brigade, a British unit of Palestinian Jews, with Kook's activism. Two American members of the Bergson Group were author and screenwriter Ben Hecht and cartoonist Arthur Szyk.