This is a hypothetical case (and IANAL) : the SCOTUS agrees to hear a case in which group XYZ claims that the NSA violated their 4th amendment rights (unreasonable search and seizure). It's widely perceived (hypothetically) that group XYZ will win the case. Before the case is heard, however, it's revealed that several of the Supreme Court Justices are now being audited by the IRS (and if they find in favor of the plaintiff ...). Is this a realistic scenario ? I believe so ....

And no question, this TYRANNICAL government could do what you pointed out: auditing the Supreme Court Justices who swing towards common sense, while a "MAJOR," case is brought before them.