My web page, Watching the Watchdogs, has reviewed the SPLC's latest "hate group" numbers and has identified numerous errors, obfuscations and outright deceptions. See SPLC — 2013 — “The New Hate Map is Here!”, March 13, 2013. Here's a sample:
James Fulford writes: As noted by Mr. Keefe, the last bar in that graph shows a decline in imaginary hate groups. This is sheer laziness on Mr. Potok's part—the reason we refer to the Southern Poverty Law Center as the $PLC is because they're paid enormous amount of money to make this stuff up. They're slacking.
Potok provides a bar graph to illustrate the steady growth of “hate groups” since 2000:
It’s worth noting at this point that the SPLC’s bloated “Endowment Fund” has doubled in size over the same span of time, from $120,000,000 to over $245,000,000.