Part one. The Dunayevskaya-Marcuse correspondence, 1954-78: the early letters: debating Marxist dialectics and Hegel's absolute idea; Dunayevskaya's Marxism and freedom and beyond; on technology and work on the eve of Marcuse's One-dimensional man; the later correspondence: winding down during the period of the New Left -- Part two. The Dunayevskaya-Fromm correspondence, 1959-78: the early letters: on Fromm's Marx's concept of man and his socialist humanism symposium; dialogue on Marcuse, on existentialism, and on socialist humanism in Eastern Europe; on Hegel, Marxism, and the Frankfurt School in the period of Dunayevskaya's philosophy and revolution; the final letters: on critical theory and on Rosa Luxemburg, gender, and revolution.