Your Rights Online.
A new IRS rule (PDF here) would effectively ban advocacy groups from informing their members of pending legislation during the weeks before an election. This would allow legisltaors ram through unpopular legislation before their constituents find out and object.
It can be applied to groups of any political leaning, but is subjective enough to selective enforcement against only those groups unpopular with the IRS bureaucracy and/or the administration. Here is an explanation of how this would work, by one affected organization.