Amritsar, Jan. 17 -- The National Investigation Agency (NIA) has summoned Baldev Singh Sirsa, who heads the Lok Bhalai Insaf Welfare Society that is one of the unions taking part in the agitation against the Centre's three farm laws, besides Sikh activists in connection with a sedition case against US-based banned pro-Khalistan outfit Sikhs For Justice (SFJ) legal adviser Gurpatwant Singh Pannu....