The Chamber of Labour, is an organisation that represents the interests of 4 million Austrian employees and consumers. Membership is compulsory for all employees working in Austria, and it is thus not to be confused with Austrian labour unions, where membership is voluntary and which are organized in an umbrella organisation, the ÖGB. Together, the ÖGB and the Arbeiterkammer represent the interests of employees in the Austrian system of Sozialpartnerschaft, which plays a major role in the regulation of wages and prices.