No, people overblow the brazilian bias judging. Le's look last night the Vitor and Nate fight.
From 20 people in the MMA media, 13 gave to Nate and 7 to Vitor, so wasnt a robbery like a bunch of people said, and two of the three judges were foreigners, non-brazilians. The three judges had 29-28 for Vitor.
Now how about Lyoto vs Phils Davis in ufc 163 in Rio ? 13 of 13 people from the media give to Lyoto the victory, but the judges give 29-28 to Phil Davis, now I ask where are the judges helping a brazilian ?
Now let's look Anderson Silva vs Brunson, [ 20 of 24 people from the media believe that Brunson won the fight(http://mmadecisions.com/decision/7772/Anderson-Silva-vs-Derek-Brunson), people didnt say "Fuck USA", they only said the judges made a mistake, but can you imagine if this happened in Brazil what people would be saying about Brazil ? would be a lot of Xenophobic comments like yesterday.
At best the judges can be influenced by the crowd only cheering for the brazilians, but this is far from being illegal and dishonest.