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That means that the government distributes directories/employment in the Bank to some Political Parties so that the Parties vote with the Government in Congress or Senate. There is a saying: It is giving that you receive. Unfortunately that is Brazilian politics...
About Caixa, I was a client a few years ago, but I don't know anybody that reached or had access to the high levels of power.

Caixa Econômica Federal
Caixa Econômica Federal (Portuguese pronunciation: [ˈkajʃɐ ekoˈnõmikɐ fedeˈɾaw], Federal Savings Bank), also referred to as Caixa or CEF, is a Brazilian bank headquartered in the nation's capital, Brasília. It is the largest 100% government-owned financial institution in Latin America. It is the fourth largest bank in Brazil by assets and one of the largest in Latin America.