Horowitz has specialised in labour theory, and most notably coined the appellation "Red Tory" in his application of Louis Hartz's "fragment theory" to Canadian political culture and ideological development, in his essay "Conservatism, Liberalism and Socialism in Canada: An Interpretation" (in the Canadian Journal of Political Science, 32, 2 (1966): 143–71).
He retired in 1974 due to ill health and spent his last years living in London, New Delhi, New York, then Istanbul, where he died.
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“Beyond Tocqueville, Myrdal and Hartz: The Multiple Traditions in America.” American Political Science Review 1993.
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