Book excerpt: John Houchin explores the impact of censorship in twentieth-century American theatre. He argues that theatrical censorship coincides with significant challenges to religious, political and cultural traditions. Along with the well-known instance of the House Un-American Activities Committee in the 1950s, other almost equally influential events shaped the course of the American stage during the century. The book is arranged in chronological order. It provides a summary of censorship in eighteenth- and nineteenth-century America and then analyses key political and theatrical events between 1900 and 2000. These include a discussion of the 1913 riot after the Abbey Theatre touring produdtion of Playboy of the Western World; protests against Clifford Odet's Waiting for Lefty, performed by militant workers during the Depression; and reactions to the recent play Angels in America.