U.S.-based Sikhs For Justice leader Gurpatwant Singh Pannun was booked under anti-terror law UAPA and other penal offences on Sunday after Khalistani banners were found put up and graffiti scrawled on walls near the main gate of the Himachal Pradesh Assembly complex in Dharamshala, police said. Himachal Pradesh Director General of Police Sanjay Kundu said Gurpatwant Singh Pannun has been …