MSNBC host Krystal Ball was in close communication with leaders of an online boycott aimed at advertisers on Rush Limbaugh’s popular radio show, e-mails between the boycott leaders indicate.

Attempting to discover the identity of an infiltrator in their group, the #StopRush leader @Shoq (aka “Shoq Value,” who is believed to be an activist named Matt Edelstein) indicated that Ball had warned another member about the suspected “right wing disrupter.” The other member had “already inquired with Krystal last week, and Krystal said ‘we don’t like or trust this guy,’” Shoq wrote in an e-mail published Thursday by Brooks Bayne at The Trenches.

Bayne said the e-mail was obtained from a Google group, “Social Action Steering,” which was apparently deleted after The Trenches published the correspondence between the #StopRush leaders. The group was attempting to discover the true identity and political leanings of a Texas man, known as “Randy Hahn,” who had joined their anti-Limbaugh effort and caused dissension among the boycotters.

Ball, a Democrat who ran for Congress in Virginia two years ago, is a paid MSNBC contributor who was recently announced as one of four co-hosts of a new daily program, The Cycle, on the left-leaning cable news network. It is unclear whether MSNBC executives were aware of the extent of Ball’s involvement in #StopRush…

Much more at the link, including evidence that President Obama’s campaign could be involved.