The Shop, Distributive and Allied Employees' Association (SDA) is the largest private sector trade union in Australia, with 203,867 members as at 30 June 2019. It has branches in every state and territory representing retail, fast-food and warehousing workers. Its membership is predominantly in casual and insecure employment within the retail and fast food sectors. The union also represents a significant membership of workers from culturally and linguistically diverse backgrounds.