When an attorney leaves the firm, either on good terms or bad terms, what is the best way to handle their known-by relationships?  Creating a known-by report shows past attorneys along with current ones, which the attorneys always complain about-- especially if they see a name they'd rather forget about.  I can see on one hand that they have a point, and all non-current attorneys should be "cleaned" from the known-bys of contacts, but I can also see how it might be valuable to know that someone whose business you want to try to get has/had a strong relationship with an attorney who left 3 months prior on the worst of terms. 
I'd be curious to know how others handle this.  I know there is an enhancement request to be able to report only on current relationships (or toggle to all), but I don't expect it to be implemented anytime soon.