During this period Brecht's influence on Weiss's plays became more evident. He also became obsessed with Dante's Divine Comedy the influence of which is present in all his works from the mid-1960s until his death. In 1965, Weiss wrote the documentary play "The Investigation" ("Die Ermittlung") on the Frankfurt Auschwitz Trials. "Like Marat/Sade" it attracted wide international attention and became the focus of heated debates about the 'right' way of representing Auschwitz and about who gets to decide what is acceptable and what is not. This was followed by two experimental plays about the struggle for self-determination in the 'Third World': "Gesang vom lusitanischen Popanz" ("Song of the Lusitanian Bogey" better translation would be "Canto of the Lusitanian Bogey" 1967) about Angola, and "Viet Nam Diskurs" ("Viet Nam Discourse", 1968). The next two plays once again focused on intellectuals and writers in times of upheaval: "Trotzki im Exil" ("Trotsky in Exile", 1970) and "Hölderlin" (1971). Between 1971 and 1981 Weiss worked on his opus magnum: his three part 1000 page novel on the European resistance against Nazi Germany, "The Aesthetics of Resistance".