A bitter row between India and Canada over the murder of a Sikh separatist is being felt in Punjab, where some Sikhs fear both a backlash from India's Hindu-nationalist government and a threat to their prospects for a better life in North America. Hardeep Singh Nijjar, a plumber who left the north Indian state a quarter-century ago and became a Canadian citizen, was shot dead in June outside a temple in a Vancouver suburb where he was a separatist leader among the many Sikhs living there. Canadian Prime Minister Justin Trudeau said last week Ottawa had "credible allegations" that Indian government agents may be linked to the killing.