An antisemitic maniac wearing a shirt with the flag of Iran on it assaulted three Jewish men in Brooklyn on Friday while screaming hateful words at the victims, according to police and sources. The brute, Andrzej Wnuk, 41, allegedly pummeled three men – a 48-year-old, 38-year-old, and 21-year-old – in the vicinity of Throop Avenue and Gerry Street in Williamsburg around 6:45 p.m. on Friday, cops said. Cops said that Andrzej Wnuk, 41, pummeled three men in Williamsburg, Brooklyn on Friday. Sources said all three men were Jewish. All three victims of Wnuk’s attack were Jewish, sources said.  The three men were walking separately when Wnuk unleashed on them — punching one man in the back, another man in the shoulder, and another in the side of the head – all while screaming “f–king Jews,” according to sources.…