Norimitsu Onishi and 

Lecture halls at Canadian and American universities have become battlegrounds for critics and defenders of Hindu nationalism, punctuated by threats of violence and even death. Temples of Sikhs and Hindus in Canada and Australia have been defaced with slogans harking back to India’s timeless divisions. Parades in two North American cities have featured displays celebrating episodes of brutal sectarian violence in India.

The Canadian government’s startling accusation that Indian government agents were behind the professional-style killing of a Canadian Sikh separatist in Vancouver has focused attention on the growing tensions within the vast Indian diaspora, reflecting divisions in India that have been fueled by Prime Minister Narendra Modi’s brand of Hindu nationalism.

Mr. Modi’s Hindu-first policies and increasing intolerance of scrutiny have spilled over into Indian communities worldwide, intensifying historical divisions among Hindus, Muslims, Sikhs and different castes. They have played out in city councils, school boards, cultural celebrations and academic circles.

“Before 2014, when Modi came to power, you didn’t see these kinds of divisions in the Indian diaspora in Canada — not at all,” said Chinnaiah Jangam, an associate professor of history at Carleton University in Ottawa and an expert on caste-based discrimination.

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