Sorry League Tags is down
I am too busy with my work and other side projects to continue maintaining this website.
I have been receiving too much e-mails because the first version of League Tags (which I never updated) was too shitty and full of issues. I had been working on a second version, but couldn't find time to finish it and probably never will.
If you need clubs, I suggest you trying to search on Reddit - there are multiple subreddits dedicated to champions and most of them have a list of clubs.
If someone want to take other this project, I'd be happy to share a dump of the club database - cleared of any personal informations.
Good luck with your club research.