No the ADL AntiDefamation League and SPLC Southern Poverty Law Center would be considered reliable third party sources for purposes of Wikipedia Clue In Wikipedia there is no requirement that the source itself be unbiased or that a source not make a secret of its bias Please review Wikipedia rules on Neutral Point of View NPOV Even if these groups are openly antisovereign citizen that would not in and of itself be a valid objection for using the source in a Wikipedia article