And some extreemist are using fight clubs to gather followers, emulating the movie in the other direction. So-called "active clubs" are springing up using "fitness" to gather young angry males to the cause. Most join without realizing. Even gym owners are surprised to discover thier facilities have become clubhouses.

https://www.jfed.net/antisemitismtoolsandresources/neo-nazi-...

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