Sadly, fan clubs are alive and kicking and, even more worrying they don't just exist for celebrities.. Another, perhaps more realistic word for the more worrying forms of 'fan-dom' is cronyism - do you have that word there? It's where people band together, merely through ignorance and/or to try to curry favour with someone in power, or who is popular..
Oh sure . Doofus Donny has lotsa cronies. He is Crony-in-Chief! Per the dictionary "CRONYISM" "The practice of favoring one's close friends , esp. in political appointments." That is Doofus Donny nailed! Add to that is his shameless NEPOTISM and you got a real winner! SIGH. Thank you for your reply! :)