More than a million marchers in 150 cities demand leader's ouster and end to corruption

Brazilian President Dilma Rousseff faced the biggest challenge yet in her turbulent second term, as more than a million protesters took to the streets in more than 150 cities to demand her impeachment and an end to corruption.

The Sunday protests, organized by right-leaning groups on social media and held across the continent-sized nation, had none of the violence seen in massive anti-government demonstrations that hit the country in 2013 and lingered into the following year.