The SDA is associated with the Labor Right, Labor Unity or Centre-Unity grouping or faction of the trade union movement and the Australian Labor Party. It also has a long-established reputation as a supporter of conservative Catholic parliamentarians. De Bruyn, himself a Catholic, is a leading figure in the right wing faction of the trade union movement and the Australian Labor Party. De Bruyn has come under scrutiny for voicing his socially conservative views while being secretary of a trade union and holding a position on the National Executive of Labor, a centre-left political party. He has repeatedly voiced opposition to abortion, and to legalising same sex marriage.