Funnily enough, no matter how much I research Brazilian politics going back to the 60s, I cant find any evidence of left wing authoritarianism. Even during the military dictatorship years, most of the time it was run by a far right parry(ARENA). The most tame one was a center party. Leftism didnt seem to gain ground until the 90s, with a leftist president-elect in 2002. 
Any sources?