In November, Kurt Vonnegut turned 80. He published his first novel, Player Piano, in 1952 at the age of 29. Since then he has written 13 others, including Slaughterhouse Five, which stands as one of the pre-eminent anti-war novels of the 20th century. As war against Iraq looms, I asked Vonnegut, a reader and supporter of this magazine, to weigh in. Vonnegut is an American socialist in the tradition of Eugene Victor Debs, a fellow Hoosier whom he likes to quote: “As long as there is a lower class, I am in it. As long as there is a criminal...