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.
In this model, trade unions are not distinct from social movements and form part of a wider ecosystem of political activism that includes faith groups, civic and residents' organizations and student groups. These are usually organized into democratic umbrella organizations along a popular front model. The umbrella organization generally has a programme or manifesto that all affiliates commit themselves to.
A prime example of social movement unionism is the link between the trade union federation Cosatu and the wider anti-apartheid struggle through the United Democratic Front in South Africa in the 1980s. More recently, Cosatu has successfully campaigned with the Treatment Action Campaign for access to medication for HIV-Aids. Social movement unionism is also a feature of the industrial relations of Brazil and the Philippines.
SMU is widely considered to be a highly dynamic and successful model, as evidenced by the success against apartheid and for treatment access, and by the fact that countries practising this model have generally reversed the trend of trade union decline experienced in the developed world. For instance, union density grew in South Africa by 130% between 1985 and 1995, during a period of steep decline in many developed countries.
In the developed world, SMU is strongly associated with the organizing model of trade unionism, and overlaps with community unionism. SMU attempts to integrate workers, trade unions and the labour movement into broader coalitions for social and economic justice. Thus, in principle, unions and other organizations support each other in what are seen as mutually beneficial goals.