Did India order last June's hit on a prominent Sikh activist outside Vancouver? Canada thinks so. PM Justin Trudeau's public airing of his spy services' suspicions has now prompted tit-for-tat expulsions of diplomats in Delhi and Ottawa. We ask about the killing of Hardeep Singh Nijjar and more broadly, the politics at play for a religious minority of 25 million: most of them in India, with a strong voice in both countries and views that range from moderate to hardline separatist.