The leaders of the Klan are well known: https://en.wikipedia.org/wiki/Leaders_of_the_Ku_Klux_Klan
After WWII they were distributed chapters (Knights of the Ku Klux Klan, Invisible Empire, Imperial Klans of America, National Knights, etc.)
Those later leaders are only leaders of that chapter/cell, not a single leader.
Distributing your hate does not make you immune is my point.
Right, terrorist groups with organizational structure and national leadership, spawned from the original KKK. We're confused about the national organization which you seem to be referring to, because "anti fascist" is not a group.