Book excerpt: Donated to the Library of Congress in the mid-1960s, Groucho Marx's correspondence was first crafted into this celebration of wit and wisdom in 1967. Reissued today with his original letters and humor intact, The Groucho Letters exposes one of the twentieth century's most beloved comedian's private insights into show biz, politics, business, and, of course, his illustrious personal life. Included are Marx's conversations with such noted personalities as E. B. White, Fred Allen, Goodman Ace, Nunnally Johnson, James Thurber, Booth Tarkington, Alistair Cooke, Harry Truman, Irving Berlin, and S. J. Perelman. To Confidential Magazine Gentlemen: If you continue to publish slanderous pieces about me, I shall feel compelled to cancel my subscription. Sincerely, Groucho Marx