This four-part study of the spirit of freedom describes the work and lives of several great twentieth century French intellectuals, and their influence on modern history. Shifts in attitudes are outlined in this fourth episode as French intellectuals stu dy Communist Cuba. Then intellectuals Sartre and Simone de Beauvoir distribute Maoist tracts in the streets. Later, revolutions in Iran, Cambodia and Tiananmen Square lead to intellectual support for human rights. Directed by Alain Ferrari, written by Be rnard-Henri Levy.