Miners' union?

[Jonesy]

My grandfather was a coal miner up until around the 1920s, I believe, where he left the Trehafod area for Somerset, after "trouble" with the union.

At least that is the story, but I would like to know more. Can someone give me an idea which union he may have been a member of?

[Peter Goodey]

Wikipedia says Trehafod was home to the Lewis Merthyr pit.

See http://www.
welshcoalmines.co.uk/index.html for information on Lewis Merhyr. "Powell Duffryn became the new owners during 1929. In the same year Coedcae ceased winding coal followed in 1930 by Hafod No.2 and in 1933 Hafod No.1 also closed". Perhaps a simple matter of pit closures led to him moving away.

See the National Register of Archives for the whereabouts of records of the Miners Federation of Great Britain / South Wales Miners Federation / Lewis Merthyr Lodge