"Foi no governo do PT para frente. O Lula e o PT institucionalizaram a corrupção. Houve essa criação de núcleos, com divisão de tarefas entre os integrantes, em estados, ministérios, fundos de pensão, bancos, BNDES. O resultado é que hoje o Estado brasileiro está dominado por organizações criminosas. O modelo do PT foi reproduzido por outros partidos"
translation:
"Lula and PT institutionalized corruption. There was this creation of nuclei, with division of tasks among the members, in states, ministries, pension funds, banks, BNDES. The result is that today the Brazilian state is dominated by criminal organizations. The PT model was reproduced by other parties"
(source: https://oglobo.globo.com/brasil/lula-pt-institucionalizaram-...)
While PT certainly didn't create corruption in Brazil, it was brought to whole new levels during its government.
To anyone interested in why brazilians elected far-right candidate Jair Bolsonaro in 2018, it was mostly due to fear of PT returning to power. This was fear was greatly strengthened by the fact that PT has strong ties to Venezuela's current government (people were afraid that Brazil would become the next Venezuela). Also see: https://en.wikipedia.org/wiki/Foro_de_S%C3%A3o_Paulo
While there were better alternatives, Jair Bolsonaro was the only candidate that stood a chance of winning, so most of his votes were anti-PT instead of pro-Bolsonaro.