Kennedy was a prominent member of the Amalgamated Transport and General Workers' Union. He served as President of the Irish Trade Union Congress in 1957. He worked closely with James Larkin, Jr and John Conroy to complete its reunification with the Congress of Irish Unions, and became President of the united organisation, the Irish Congress of Trade Unions, in 1961. He also served on the Northern Ireland Economic Council.
Kennedy served as a Northern Ireland Labour Party member of the Senate of Northern Ireland from 1965 until its proguation in 1972. From 1970 to 1971, he served as a Deputy Speaker. He then withdrew from politics and trade unionism, and led the consortium which established Downtown Radio, Northern Ireland's first commercial radio station.
- Donal Nevin et al, Trade Union Century, p.437
- W. J. McCormack, The Blackwell Companion to Modern Irish Culture, p.331
- "Constitution and Standing Orders Archived 6 June 2011 at the Wayback Machine." (2008), Irish Congress of Trade Unions, p.36
- Dáil Éireann - Volume 257 - 25 November 1971
- Members of the Northern Ireland Senate, 1921-72, Northern Ireland Elections
- "Contest for 12 seats in N.I. Senate", Irish Times, 21 May 1965
- "Radio station for Ulster", The Guardian, 28 October 1975, p.15
|Trade union offices|
J. Harold Binks
|President of the Irish Trades Union Congress
James Larkin Jnr
|President of the Irish Congress of Trade Unions
W. J. Fitzpatrick