Columbia subject headings:
Ação Popular (Organization : Brazil)--History.
Ação Popular Marxista-Leninista do Brasil (Organization)--History.
Communism--Brazil--History.
Partido Comunista do Brasil--History.
Harvard subject headings:
Ação Popular (Organization : Brazil)--History.
Ação Popular Marxista-Leninista do Brasil (Organization)--History.
Communism--Brazil--History
Partido Comunista do Brasil--History.
Princeton subject headings:
Ação Popular (Organization : Brazil)--History.
Ação Popular Marxista-Leninista do Brasil (Organization)--History.
Communism--Brazil--History.
Partido Comunista do Brasil--History.