This Panamanian sociologist and political activist gives us what appears to be the real scoop on what is happening in Brazil with the right-wing attacks on the Rousseff government and the PT party. I think it is an excellent illustration of the vulnerability of left-wing governments to opposition organized by ruling capitalist classes. This is also happening in Venezuela and Argentina.
I agree with the author's conclusion:
The Latin American experience in general and the Brazilian in particular show that the only way to save progressive political processes from the attacks of the right wing and imperialism is not by trying to negotiate and give in to their demands, but by convening popular mobilization and taking more radical socialist measures.(You might also be interested in what is happening to counter the right-wing resurgence in other countries of South America covered in this piece entitled "Latin America Briefs".)