Some cab companies have used "abusive means to block the entry of Uber in the market" that includes violence against Uber drivers and passengers, the watchdog said in a statement.
As long as controversy over the legality of Uber in the country is not resolved, the software should be considered a competitor in the market, the watchdog said.
The country's main cities Sao Paulo and Rio de Janeiro are moving to ban the mobile application after a series of protests by taxi drivers and strong lobby by local politicians.
President Dilma Rousseff blamed the application for increasing unemployment, calling on local authorities to regulate the service.
© Thomson Reuters 2015
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