The Postal and Telecommunications Workers' Union was a trade union representing communication workers in Ireland.
The IPOEU was unhappy with the merger arrangements, and so it withdrew early on, to continue an independent existence.
From 1924 to 1957, the union was led by William Norton, who for much of this time also served as leader of the Labour Party.
Under his leadership, the union steadily grew, from 4,000 members in 1930, to 7,302 in 1960.
The small Transferred Officers' Protection Association amalgamated with the union in 1930, and the Post Office Clerical Association joined in 1958.