I'm sorry, but... what?
The Executive is the one closest to this qualification, but Lula, Haddad, Zé Múcio, Tebet and the others in power are nowhere even close to being socialists! Lula perhaps, until about a couple decades ago was a little bit closer but now he's not even on the left very much.
The Congress and the Senate, on the other hand, are mostly in the hands of neopentecostal evangelicals, the pro-gun nutjobs, the agrobusiness tycoons and other capitalists and fascists.
1 - EXECUTIVE:
Lula is in the literal workers' party.
Fernando Haddad, Minister of Finance, did his own Master's dissertation defending socio-economics of the USSR, before the USSR collapsed and was an embarrassment for cocktail communists everywhere. The guy who calls economic shots is literally a communist fanboy.
Carlos Lupi, also Minister, is literally one of the vice presidents of the Socialist International . The word socialist is literally in the name, and he is VP of it worldwide!
2 - CONGRESS:
The opposition is in clear minority in in both chambers[1]. The opposition has almost a 2:1 deficit vs the Government inside the Chamber of Deputies
3 - MACRO:
The president's own party is in an alliance with the communist party[2]
[1] https://en.wikipedia.org/wiki/National_Congress_of_Brazil [2]
Anyway a thorough explanation of the applicable law, point by point
https://news.ycombinator.com/item?id=39966382