Fourty-eight-year old Sunil Sarkar, a tailor by profession in Dimoria village, about 40 km away from Guwahati, has been anxious ever since Assam released its citizen list. His Bengali-Hindu parents migrated from Sylhet, a city earlier in eastern Pakistan and now in eastern Bangladesh, to Assam's Nagaon in the 1960s over "fears of religious persecution", he says. Sarkar can't read or write. He does not have a birth certificate. But he claims he was born in Assam. In 2015, he was served a notice over his citizenship by the Foreigners Tribunal that later ruled he was an Indian citizen. But he and his family of three do not figure in the Assam citizen list.