What happened
The scandal broke on 6 June 2005, when federal deputy Roberto Jefferson (PTB) told Folha de S.Paulo that the governing Workers' Party (PT) paid a monthly stipend — a mensalão, or "big monthly payment" — of around R$30,000 to allied congressmen in exchange for votes in the Chamber of Deputies (Folha). Jefferson said PT treasurer Delúbio Soares ran the scheme, that ministers including José Dirceu and Antônio Palocci had been warned, and that the funds reached the PP and PL benches (Câmara).
The money was traced to publicity agencies owned by Belo Horizonte businessman Marcos Valério, with cash withdrawn from Banco Rural and Banco do Brasil and carried to Brasília (Wikipedia PT). Congress opened multiple committees of inquiry; several Lula aides resigned and deputies faced the choice of resignation or having their mandates revoked (Wikipedia EN).
The Federal Public Prosecutor's Office charged the participants, and the Supreme Federal Court (STF) tried the case directly as Criminal Action 470 (Ação Penal 470) because sitting legislators held privileged jurisdiction. The trial opened on 2 August 2012 with 38 defendants and Justice Joaquim Barbosa as rapporteur (Wikipedia PT). On 9 October 2012 the court convicted Dirceu, Genoino and Soares of active corruption; Dirceu was sentenced to ten years and ten months, Genoino to six years and eleven months (Wikipedia EN). Valério received eleven years and eight months (ConJur). In total, 25 defendants were convicted (Gazeta do Povo).
On 13 November 2013 the STF ordered the convicted to begin serving their sentences (Câmara). Then, on 27 February 2014, a reconfigured court ruled 6–5 on embargos infringentes (a final appeal available where four or more justices had dissented) that eight defendants, including Dirceu, Genoino and Soares, had not committed the separate crime of "criminal conspiracy" (formação de quadrilha), reducing some sentences while leaving the corruption and money-laundering convictions standing (ConJur).
Where the dispute is
The contested question is not whether the scheme existed — the STF, after a 53-session plenary trial, found it did — but how to weigh it politically.
PT supporters and parts of the anglophone press long framed the affair as either exaggerated or as standard coalition financing inflated into a scandal for partisan ends; some on the left treated the conviction of party leaders as politically motivated (openDemocracy). Opposition figures and most legal commentators argued the case proved a deliberate, centrally organized system to buy a congressional majority with laundered public and private money (BBC).
A second dispute concerns the 2014 reversal on the conspiracy charge. Critics read the 6–5 embargos infringentes ruling — decided after changes in the court's composition added justices appointed by PT presidents — as the judiciary softening its own landmark verdict; defenders read it as ordinary appellate correction of an overreaching charge (ConJur). The core corruption convictions survived either way.
TDIBr's reading
TDIBr's reading: the Mensalão was a real, systematic vote-buying scheme run from inside the governing party, established as such not by a newspaper but by the STF in the most juridically closed corruption verdict of its era — a 53-session trial that convicted 25 people, including the president's chief of staff. The recurrent claim, repeated in parts of the Brazilian left and echoed in sympathetic foreign coverage, that the Mensalão was a media invention against the PT is a founding myth the facts do not support: it was a sitting government deputy, Roberto Jefferson, who described the monthly payments, and a unanimous-on-the-core-charge Supreme Court that confirmed them (Wikipedia EN).
This is also why the case illustrates a pattern rather than breaking it. Brazil rarely convicts the politically powerful; Mensalão is the exception that proves the rule — and even here, the 2014 reversal on the conspiracy count, decided 6–5 by a court whose composition had shifted, shows how quickly a landmark verdict can be pared back at the margins (ConJur).
A right-leaning founding myth should be named too: that the Mensalão proves Lula personally directed the scheme. He was never a defendant in Criminal Action 470, and the STF made no such finding (Wikipedia EN). The documented facts are the scheme, the funds, and the convictions of party leaders — not a presidential conviction that did not happen.
Why it matters internationally
For an anglophone reader, the Mensalão is the case that fixed corruption at the center of 21st-century Brazilian politics a decade before Lava Jato made the country a global byword for it. It established that a Brazilian Supreme Court could try and jail a governing party's top leadership — a precedent invoked, contested and partly walked back in every corruption fight since. It also previews a durable feature of Brazilian institutions covered across TDIBr: verdicts that look definitive can soften as courts change composition, so "convicted" and "jailed" are not the same as "case closed." Anyone following Lula's later trials, Lava Jato's partial annulment, or current debates over the Supreme Court's reach is reading a story whose template was written here.
Further reading
- STF — Criminal Action 470, official rapporteur's report (PDF)
- Câmara dos Deputados — Understanding the Mensalão and Correios cases
- Câmara dos Deputados — STF orders sentences served for those convicted
- Folha de S.Paulo — Jefferson's interview that revealed the scheme
- ConJur — STF convicts José Dirceu (sentencing detail)
- ConJur — 2014: STF rules the convicted formed no criminal conspiracy
- Gazeta do Povo — STF convicts Dirceu, Genoino and Delúbio of corruption
- BBC — Mensalão trial: Lula aide 'led corruption scheme'
- Britannica — Mensalão scandal
- Wikipedia (EN) — Mensalão scandal
This article was written with the assistance of AI and reviewed by the TDIBr editorial team.