Kyle Rittenhouse flashed a hand sign adopted by some white supremacist groups and was “loudly serenaded” with a song reportedly adopted by the far-right group the Proud Boys as the 18-year-old drank at a Wisconsin bar last week, prosecutors said in a court filing Wednesday. Kenosha County prosecutors asked a judge to modify the rules Rittenhouse has to follow while he’s free on $2 million bail as he awaits trial on murder and other charges for shooting three men, two of them fatally, with an AR-15-style rifle during chaotic protests Aug. 25.