The Client Protection Fund of the Bar of Maryland, the state's legal licensing body, provides Avvo with information for 34,000 lawyers, including the name, address and date of admittance to practice in the state. Avvo pays a standard fee for the agency to produce the list. So far, none of Maryland's members have complained, according to the bar's administrator.
A shiny virtual nickel to someone who shows me how to quote text on this website.
Edit: it's unclear how the directory of DC Bar (as opposed to Maryland bar) was obtained and what specific claim the DC Bar is alleging.
As a general rule within the USA there's no copyright in raw facts (themselves), though there is in any presentation of said facts.
Thus if AVVO got a printed copy of the DC Bar's printed members' directory and then hired some people to type it up, they'd be fine.
Where they might not be fine is if the DC Bar had some kind of terms-of-use on their site that says "you can't use this site except for personal use" and then the DC Bar could show that Avvo obtained the information via the website.
The first point seems to be true: http://www.dcbar.org/copyright.cfm
(for background: http://web.archive.org/web/*/http://www.dcbar.org/copyright.... )
The second point -- whether or not the Avvo obtained their listings via the site or not -- is clearly a point of contention.
Given the previous willingness to legally obtain the listing (even paying actual money) I'd be surprised if the Avvo founders haven't dotted their i's and crossed their t's on this one.