welcome to the forum.

I don't know much about the history of cleveland organised crime except for a few of the key characters but i thought i could help.

Recently theres been some major drug busts in the cleveland area involving local black organisations aswell as nigerians, mexicans, columbians. In one of the gangs a member actually made a movie about drug dealing and gang life.That could be quite funny. I posted them up. http://www.gangsterbb.net/threads/ubbthreads.php?ubb=showflat&Number=743917

http://www.gangsterbb.net/threads/ubbthreads.php?ubb=showflat&Number=740596

Theres a number of russian/eastern european criminal groups that have been busted in the area too.
http://www.fbi.gov/cleveland/press-releases/2009/cl102909.htm

http://blog.cleveland.com/metro/2009/07/clevelandarea_russian_mob_expe.html

Asian human trafficking and prostitution rings.
http://www.cleveland.com/metro/index.ssf/2013/11/cleveland_fbi_agents_raid_east.html

There was this story about illegal activity and gambling in internet cafes.
http://www.cleveland.com/open/index.ssf/2013/02/more_witnesses_say_internet_ca.html

There also been jamaican gangs that have operated in cleveland in the past.

I think that as far as lcn is concerned it think a good story to look at is about Joseph "Joe Loose" Iacobacci who was the last boss of what was left. I think there was estimated to be about 10-15 members and associates left at the time.
http://www.ipsn.org/organized_crime/cleveland_mobsters.htm

I know you don't want to give away too much on here but is the crime family or a member of one the main characters of your story?

If not they can be a pretty shitty group of people, they really could be a crime family on its last legs with junkies, psychos and old people making up the ranks. You get like a few guys that get tired of being apart of a dying enterprise so they rip off some big time drug gang that comes after the entire family and their all trying to survive.