 From 1996 to 1999, he worked as substitute coordinator of the National Committee of Surveillance against the extreme right, which held weekly meetings with the 45 major political parties, unions and associations belonging to the French left-wing in order to draw up a common response to escalating intolerance.Between 1999 and 2002, Meyssan replaced Emma Bonino in the leading post of the Anti-prohibitionist Radical Coordination, an international organization aiming to decriminalize drug use as a means to cut organized crime's main source of income.In 2002, he published a book on the September 11 terrorist attacks—""—in which Meyssan argues that such attacks were organized by a faction of the US military–industrial complex in order (1) to impose a non-democratic regime in the United States and (2) to extend US imperialism.