Mr Riordan represented the Australian Labor Party in the House of Representatives.
Subject to investigation
Agency associated with person unregistered
1952-1953: Federated Clerks' Union, NSW Branch - Assistant Secretary
1954-1954: Federated Clerks' Union, NSW Branch - Secretary
1954-1958: Federated Clerks' Union, NSW Branch - [? Branch Officer]
1958-1973: Federated Clerks' Union - Federal Secretary
1963-1967: Australian Council of Trade Unions, Executive - Member