"A ninety-year-old Du Bois was hopeful, too, in another way. "Today, the United States is fighting world progress, progress which must be toward socialism and against colonialism," he said, speaking to seven hundred students and faculty at Howard University in April 1958. Later in the year, having gotten his passport back, Du Bois toured Eastern Europe, the Soviet Union, and Communist China, where he happily met Chairman Mao Tse-tung. When Mao started musing about the "diseased psychology" of African Americans, showing that he was attuned to the latest racist social science, Du Bois interjected. Blacks were not diseased psychologically; they lacked incomes, Du Bois explained, inciting a debate and a fusillade of questions from Mao. When Du Bois expressed some of his failures as an activist, Mao interjected. Activists only failed when they stopped struggling. "This, I gather," Mao said, "you have never done.""