The 1971 Harco work-in was an action undertaken by workers at a steel plant in Campbelltown, New South Wales, Australia. The work-in was the culmination of a protracted industrial dispute between the owners of Harco Steel and the workers at the Campbelltown site. The dispute arose as a result of worker objections to the owners' practice of sacking and then rehiring workers to reduce costs during periods of low production. The work-in lasted for a period of four weeks. Workers' self-management was practiced, leading to an increase in productivity of around 26%.