Work bans placed on specific sites for environmental or conservation reasons, part of a campaign carried on from the 1970s by the New South Wales Builders Labourers Federation in support of residents' groups.
When builders labourers, organised by their union, refused to work on projects they found socially or environmentally undesirable, in Sydney in the 1970s, they started a new form of environmental activism. The Green Bans were to change the way Sydney developed
