Clone-
GC was also (quite famously) gone after by the IRS in the late 90s for the way they do support raising for staffers. The question was whether it was acceptable to give a donation to a charitable organization and then force them to use it for a particular purpose.
GC won that battle, as I recall. I think I have a link around here somewhere...
This one is brief, and from a conservative source.
http://ctlibrary.com/1104There used to be a goldmine of info on the IRS website (this was a very, very, very important lawsuit- did I mention very?), but I can't find it quickly. All of the filings, etc. are available somewhere (for free).
Anyhoo, after that experience, I'll bet anyone would be a little freaked out to hear the name of the IRS dropped.
As to litigation, I'm not aware of any commenced against GC, but frankly, I'd be a bit suprised if there wasn't. I've read old newspaper articles where people threatened it. I'd imagine any lawsuit from members/families against GC would be filed in Federal Court (diversity action), so it should show up on pacer. I'll see if I can look later.