See here for details of a lawsuit against the SPLC by a lawyer, formerly employed by the City of Baltimore. The grounds of the lawsuit, include the allegation that the SPLC paid for stolen documents and documents covered by Attorney-Client privilege. Here is an article by the SPLC about the complainant.
The lawsuit ties in with this article I wrote, about how to deal with competent employees being dismissed, solely because of their political opinions and affiliations. I would add that if a law is enacted, then the third parties concerned might stop engaging in this malicious behaviour.
The Claimant has asked for donations to the lawsuit and has provided the following contact details, Glen Allen, P.O. Box 10441, Baltimore, Md. 21209.