In the shadows of the Lava Jato probe into graft activity at state oil company Petrobras, prosecutors in Brazil are tackling another corruption investigation that could implicate dozens of Brazilian companies in allegations of tax evasion. All of those named or charged have denied wrongdoing or, in the case of distributor MMC Automotives, have declined to comment. The FT's John Paul Rathbone talks to Samantha Pearson in Sao Paulo about the latest developments.

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