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Social movement unionism (SMU) is a trend of theory and practice in contemporary trade unionism. Strongly associated with the labour movements of developing countries, social movement unionism is distinct from many other models of trade unionism because it concerns itself with more than organizing workers around workplace issues, pay and terms and conditions. It engages in wider political struggles for human rights, social justice and democracy. Social movement unionism grew out of political struggles in developing countries and was theorized as a distinct industrial relations model in the late 1980s and early 1990s.