A former colleague claims George Floyd and “killer” cop Derek Chauvin knew each other and clashed while working at a nightclub together. David Pinney, who worked with both men at El Nuevo Rodeo, told CBS News George Floyd and Derek Chauvin clashed while working security at the Minneapolis venue. He said: “They bumped heads. “It has a lot to do with Derek being extremely aggressive within the club with some of the patrons, which was an issue.” Floyd …