SAO PAULO (AP) — Microphone in hand and standing atop the sound truck, the raspy-voiced protest leader jabbed his finger into the air shouting for the ouster of Brazilian President Dilma Rousseff, igniting wild cheers from the crowd below him. [...] more surprising than the crowd of over 200,000, according to the Datafolha polling and statistics agency, was the fact it was being led by Kataguiri, a skinny, 19-year-old college dropout, and other young Brazilian activists inspired by libertarianism and conservative free-market ideals. A widening kickback scandal at Petrobras, the state oil company, is one of several complaints undermining the administration. Kataguiri and others are striking a chord with Brazilians fed up with soaring inflation, a high and growing tax burden, and those who blame government intervention for hobbling Brazil's economy, which grew just 0.1 percent last year and is expected to shrink in 2015. The comedian asked Kataguiri and other young, anti-Rousseff producers and designers to help create a sketch before the October presidential runoff vote, which saw Rousseff narrowly beat her more conservative, market-friendly opponent. Some media in Brazil have railed against the young libertarians, accusing them of receiving money from right-wing groups in the U.S.