@Lance
Did you read the article?
Imagine some EXTREM right/left/whatsoever winger commits a serious crime (terrorism, murder, etc.) and later it was found out that the government had not seen it coming at all, what would happen? Everyone would be mad how the FBI and other authorities could have missed that. But to have intel (sp?) you have to have groups under surveillance. EXTREMIST groups preferably because they are usually the first ones to use violence to achieve their targets.
Why right wing groups should be spared from this is beyond me. Here in Germany we have some problems with both left and right wing radicals. They both DO commit crimes ranging from propaganda over destroying property over bodily injury to murder. So the BKA (German FBI) keeps an eye on both.