Since the late 1990s, some historians have attempted to re-examine and evaluate the significance of his activities during World War II and his role as a political opponent of Begin. One allegation is that Kook's adversaries in Israel and America downplayed some of his accomplishments and minimized their own role in curtailing his activities. David Wyman and Rafael Medoff, co-authors of a 2002 Kook biography, suggested that, despite the frequent obstruction by the modern American Jewish establishment, Kook's rescue group's activism was the major factor in establishment of the War Refugee Board and that it was an instrument rescuing approximately 200,000, partly by means of the Raoul Wallenberg mission.