Review Essa Y : Class, Consciousness and American Politics: CLASS AND POLITICS IN THE UNITED STATES, by Richard F. Hamilton. John Wiley and Sons, Inc., New York, 1972, xiv + 589 pp., $14.95. THE HIDDEN INJURIES OF CLASS, by Richard Sennett and Jonathan Cobb. Alfred A. Knopf, Inc., New York, 1972, 275 pp., $6.95