ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti ˈeɪt, hiː kəlˈæbɚɹˌeɪɾᵻd wɪð ɑːktˈævɪˌoʊ ɡɛtˈiːnoʊ ænd fɜːnˈændoʊ ˈiː. səlˈɑːnəz mˈɛmbɚz ʌv ɡɹˈuːpoʊ sˈɪn lˌɪbɚɹˌeɪsɪˈɑːn ɔnðə fˈoːɹˈaʊɚ dˌɑːkjuːmˈɛntɚɹi hˈoːɹə də lˌɑːs hˈoːɹnoʊz, ɐbˌaʊt fˈɔːɹən ɪmpˈɪɹiəlˌɪzəm ɪn sˈaʊθ ɐmˈɛɹɪkə.
In 1968, he collaborated with Octavio Getino and Fernando E. Solanas (members of Grupo Cine Liberación) on the four-hour documentary Hora de los hornos, about foreign imperialism in South America.