Politics and government 46 Underground press publications 16 History 13 Protest movements 13 Vietnam War, 1961-1975 12 Civil rights 11 Political activists 11 Counterculture 8 Social conditions 7 Student movements 7 Presidents 5 Radicalism 5 Social movements 4 Liberalism 3 Race relations 3 Riots 3 Vietnamese Conflict, 1961-1975 3 Demonstrations 2 Foreign relations 2 Labor movement 2 Peace movements 2 Political activity 2 Students 2 African Americans 1 Afro-Americans 1 Christians 1 Civil rights movements 1 Communism 1 Congresses 1 Conservatism 1