A military police officer aims his gun to a demonstrator during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. The officer had picked up a bottle that was thrown towards them but did not fire his gun and backed away. Thousands of workers have staged rallies in 12 cities across Brazil to protest against a proposed law that would allow companies to outsource their labor force. (Photo by Eraldo Peres/AP Photo)

An elder woman hits a motorcycle driver that wants to pass through the march during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. Thousands of workers have staged rallies in 12 cities across Brazil to protest against a proposed law that would allow companies to outsource their labor force. The biggest rally occurred in Brasilia where some 3,000 demonstrators gathered in front of Congress hours before lawmakers were expected to vote on the law. (Photo by Eraldo Peres/AP Photo)

A police officer searches residents in a alley of the Alemao slum complex as part of a security reinforcement by the UPP (Police Pacification Unit) in Rio de Janeiro, Brazil, Tuesday, April 7, 2015. Authorities have reinforced the area due to the violence that has wracked the Complexo Alemao in recent days, with a young boy and a 41-year-old housewife killed by stray bullets as gangs and police exchange intense gunfire. (Photo by Leo Correa/AP Photo)

A demonstrator and a military police officer confront each other during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

A military police officer sprays tear gas on a demonstrator during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

People stand behind a gate at the entrance of an abandoned residential apartment building in the middle class Flamengo neighborhood of Rio de Janeiro, Brazil, Tuesday, April 7, 2015. Squatters invaded the residence that Brazil's one-time richest man was supposed to transform into a luxury hotel ahead of the 2016 Olympic games and are demanding city officials put them into social housing. (Photo by Silvia Izquierdo/AP Photo)

Police officers make a barricade out of cement filled steel drums and sand bags while building a checkpoint at the Alemao slum complex as part of a security reinforcement by the UPP (Police Pacification Unit) in Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Leo Correa/AP Photo)

A woman stands behind a gate inside an abandoned building in the middle class Flamengo neighborhood of Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Silvia Izquierdo/AP Photo)

Police officers make a barricade out of cement filled steel drums and sand bags while building a checkpoint at the Alemao slum complex as part of a security reinforcement by the UPP (Police Pacification Unit) in Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Leo Correa/AP Photo)

A woman holds open a banner that reads in Portuguese “Such cowardice. Investment in Olympics and not housing” to show it to the press and neighbors from inside an abandoned building in the middle class Flamengo neighborhood of Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Silvia Izquierdo/AP Photo)

A demonstrator clashes with military police officers during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

A worker shouts slogans against a proposed law that would allow companies to outsource their labor force, during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

A military police officer sprays pepper spray in a demonstrator's face in a clash during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

A woman hides her face from the press with a blanket inside an abandoned building where a sign reads in Portuguese “We want housing, a home to call ours” in the middle class Flamengo neighborhood of Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Silvia Izquierdo/AP Photo)

An injured union worker with blood on his face walks towards a line of military police officers to confront them after he was injured by them in a previous encounter, during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

An abandoned building stands in the middle class Flamengo neighborhood of Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Silvia Izquierdo/AP Photo)

Police officers walk past armored container used as a police station in the Inferno Verde area, or “Green Hell” in Portuguese, of the Alemao slum complex as part of a security reinforcement by the UPP (Police Pacification Unit) in Rio de Janeiro, Brazil, Tuesday, April 7, 2015. (Photo by Leo Correa/AP Photo)

A military police officer aims his gun to a demonstrator during a protest in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

Military police officers keep back demonstrators with pepper spray as they detain a worker during a protest in front the Congress building, in Brasilia, Brazil, Tuesday, April 7, 2015. (Photo by Eraldo Peres/AP Photo)

A police officer carries a kitten that was found in an area where the police is building a checkpoint in the Alemao slum complex as part of a security reinforcement by the UPP (Police Pacification Unit) in Rio de Janeiro, Brazil, Tuesday, April 7, 2015. The kitten was found with several others and the litter was taken to a store close by to be taken care of. (Photo by Leo Correa/AP Photo)