Morrow grew up in Belfast, and studied at the Belfast Technical School. He became active in the Northern Ireland Labour Party and served as its chairman in 1949/50. He worked as an organiser for the Amalgamated Engineering Union, and in 1970 he served as President of the Irish Congress of Trade Unions.
Morrow contested Belfast South in the 1945 UK general election, taking 17.5% of the vote, then in Belfast North, at the 1951 general election, where he took 39.3%. He came closest to election in Belfast Duncairn at the 1945 Northern Ireland general election, taking 45.5% of the vote, but his share dropped to 16.9% in 1949, and recovered only slightly at a by-election held later in the year.
- The Times House of Commons 1951, p.206
- Donal Nevin et al, Trade Union Century, p.439
- F. W. S. Craig, British Parliamentary Election Results 1918 – 1949
- F. W. S. Craig, British Parliamentary Election Results 1950 – 1970
- Northern Ireland Parliamentary Elections Results: Boroughs: Belfast
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