In the lead up to and following the announcement of the plebiscite, now survey, on changing the Marriage Act, unions have played a prominent role in promoting and resourcing the Yes campaign.

Senior union officials have been speakers at rallies, there have been large union contingents at protest marches and unions — especially peak bodies such as Victorian Trades Hall Council and the Australian Council of Trade Unions — have been providing infrastructure to help build the capacity for the campaign to ensure maximum participation and support for the Yes side.