Surrealism was a broad movement, which attracted many adherents. It was organized and quite strictly disciplined, at least until the death of its leader, Andre Breton, in 1966. As a consequence, its membership was in a constant state of flux: persons were constantly being admitted and excluded, and often the latter continued to regard themselves as Surrealists. The wide-ranging nature of the Surrealist movement was spread over many countries and many different art forms, including painting, sculpture, cinema, photography, music, theater, and literature, most notably poetry. The Historical Dictionary of Surrealism relates the history of this movement through a chronology, an introductory essay, a bibliography, and over 600 cross-referenced dictionary entries on persons, circles, and groups who participated in the movement; a global entry on some of the journals and reviews they produced; and a sampling of major works of art, cinema, and literature."