The Internal Revenue Service has revoked the tax-exempt status of a conservative group for engaging in political activity. Meanwhile, the liberal-leaning watchdog group Media Matters has kept its tax-exempt status. 

Is Ron Paul's Group Being Targeted By IRS Over Son's Possible 2016 Run?

The IRS charged in a written determination that the Patrick Henry Center for Individual Liberty “made repeated statements supporting or opposing various candidates by expressing its opinion of the respective candidate’s character and qualifications.”

On the other side, Media Matters' CEO David Brock even describes himself as a “Democratic political activist” on his official Twitter profile.

Fox News contributor Juan Williams pointed out that Brock has spoken at the Clinton Library and written a book that is “trumpeting” Hillary Clinton for president.

Fox and Friends co-host Steve Doocy wondered how the IRS can justify Media Matters’ tax-exempt status while the group is trying to run a private company like Fox News out of business.

Williams said it’s unclear whether Brock goes after Republican candidates, but his attacks on Fox News and the like are based on his own “political agenda.” 

“In this case, it seems to me there is a singular purpose which is to attack what was once called the vast right-wing conspiracy. I mean, they’re just after anybody that they see as right-leaning or conservative in the country, and there is no general attempt to educate people on media matters," Williams said.

The bigger problem, Williams identified, is that the standards are being applied differently.

“I don’t think that anybody should be using the IRS for any political purposes. Keep them away from politics because it may be one day that it’s on your side and the next day it’s on the other guy’s side. And guess what, that dog is biting you,” he said.

'Caught Red-Handed': Sekulow Details New 'Smoking Gun' IRS Emails

O'Reilly on IRS Scandal: Holder Will Cite 'Ongoing Investigation' Until Obama Leaves Office