Frank Bongiorno is Professor of History at the Australian National University and Distinguished Fellow of the Whitlam Institute within Western Sydney University. This is the text of a keynote lecture delivered at The Spirit of 1975: Transformations in Australian Labour History, the nineteenth conference of the Australian Society for the Study of Labour History in Melbourne on 28 November 2025. It is part of a larger project undertaken with James Watson of the Australian National University with the support of the Whitlam Institute.