"I was impressed with Micheal Flatley in the Comhaltas
convention in St. Louis a while back sharing the stage with African-American tap experts showing the connection between clogging and step-dancing from two different cultures.
It illuminated the role of Irish step-dancing."

I wonder if they talked about William Henry Lane, "Master Juba", at all? He was a free black man who grew up in New York in the 1840s or 50s. He learned Irish dancing from both the Irish in his neighbourhood and from other black dancers, and beat Irish dancing champions when dancing jigs and reels. The dance style he evolved is thought to be one of the main roots of tap dance.

He died really young, but not before coming to England and dancing in front of Queen Victoria.

An interesting footnote is that, at this time, white men always portrayed blacks on stage. It was the height of minstrelsy. So when Master Juba performed, he had to black up. The world was not ready to see a real live black man on stage.

Not sure that any of this is much to do with Folk Against Fascism, but an interesting example of different cultures collaborating to create something brand new.