Engineering firms working for Petrobras, the state-oil company, had overcharged the oil firm. The profits made in this manner were passed on to the Workers' Party. This has been going on for the past 15 years. They ended up as funds provided to the political party. They have become the bone of contention. A comprehensive investigation into the nitty-gritties of the scam unearthed the involvement of President Dilma Rousseff along with 47 other politicians.
One of the firms is found to have paid a sum of 1.5 million Real (about 328,000 Pounds) to a graphics company, but the money ended up in the Worker's Party(WP) coffers. WP treasurer Joao Vaccari was arrested by the Brazilian police in connection with investigations into corruption in Petrobras. He is to face trial for accepting kickbacks and graft. He is also to be tried for money laundering. A lot of anomaly was also found in the bank accounts of Vaccari and his relatives.
Vaccari's arrest points fingers at the implication of Brazilian President Dilma Rousseff in the scam. She was the chairperson of the company from 2003-2010. Money from the oil-company ended up financing her election campaigns in 2010 and 2014.
Rousseff and her party condemn the arrest of Vaccari. But the judiciary says those involved in the corruption case are a major threat to the society. Vaccari has denied his involvement in the Petrobras scam. He said he was not a part of the party's finance committee in the run up to the elections in 2010 and 2014. He denies involvement in raising funds for Rousseff's elections.