The Coup d'état of 1964 and subsequent restriction of civil rights and freedom of expression in Brazil is commonly marked as the shifting point, whence artists such as Cildo Meireles and Rubens Gerchman began creating explicitly political art. Particularly after 1968, when the military government legalized torture, Brazilian art was marked by rather radical actions and happenings. The São Paulo Art Biennial, the second oldest art biennial in the world, opened up with most of its walls empty due to a boycott from the artists. In 1970, the exhibit Do Corpo à Terra ("From Body to Earth") took place in Belo Horizonte, and included rather shocking actions such as Cildo Meireles setting live chickens on fire in front of a live audience and Artur Barrio ditching blood-soaked packages in a river, giving off the impression that the people who disappeared under the military government had "reappeared" in this gruesome fashion.