Too late, I looked it up

https://en.wikipedia.org/wiki/Affinity_group

“Affinity groups engaged in political activism date to 19th century Spain. It was a favourite way of organization by Spanish anarchists (grupos de afinidad), and had their base in the tertulias or in the local groups.”

It’s not the best wikipedia page I have skimmed.

Combined Monkey Years just aren’t the same since their lead singer left, I’m hoping they improve eventually.