Well, Dai. aren't you the lucky one! I have a copy of this CD with next to no sleeve notes at all, just some color pictures of Welshmen of different ages (some of whom might be the band) and a closed fish & chip shop on a council estate. For this song it says Words Jones, Music Jones McDonald.

Do I have a US edition? Are your sleevenotes in Welsh?

To come to your question, the American Labor movement is filled with songs, parodies of hymns often enough, with tunes everyone knew, encouraging joining the union. British labor movements too. Then there are the Ban the Bomb songs, same deal as far as I'm concerned. Every time there's an H-bomb test you get a little more strontium under your vest; that's dissemination of information in my book, however primitive.