Black Bloc anarchists joined other protestors in more than a dozen Brazilian cities Tuesday to mark Guy Fawkes day, the anniversary of the failed 1605 Gunpowder Plot in London. Many here have donned Guy Fawkes masks in recent months as they took to the streets unhappy with corruption and political administration. "We want to change this corrupt system," said Eron Morales de Melo, a veteran protester dressed as Batman.