Wayne Anthony Ross, who was then the NRA Vice President, fought the 2001 cancellation of this Alaskan psychotic's concealed carry permit revocation case, pro bono, and won. 
http://articles.latimes.com/2002/jan/06/local/me-20649

The NRA successfully just fought the legislation meant to keep people who are receiving SSI disability by virtue of their mental incompetence to purchase firearms. The prime reason for getting Supplemental Security Insurance handouts is severe mental problems. 

Adam Wayne Sullivan had a history of violence, rage, stalking and threats going back at least 22 years, just after he turned 18, and probably longer, but his juvenile record is not accessible.