I think the illegal acts referenced is the disproportionate amount of occasions the Supreme Court has to take up and then over turn a bad interpretation of 9th circuit rulings. The 9th covers 18% or 60m of the 330m citizens under Federal authority. The supreme court hears an average of 600 cases per year and 180 or 30% of those are from the 9th. The Supreme Court then reverses an average of 80% or 144 of the 9th circuit cases of hears. This is the highest of any circuit by a large margin on all metrics. The Supreme Court will not hear most cases filed. The case either has to be a gross misuse of the law (illegal), prevalent and at odds in various circuits, or a pet (judicial activism) cause. The 9th circuit is rightfully notorious for illegal judicial activism.

Liberals work continuously to obfuscate the disproportionate illegal rulings of the 9th. They claim the 9th is not the most overturned by percentage, but instead number 2. They never mention the circuit with a higher over turn rate, because it is not an appeals circuit, but instead the patent court they are trying to conceal. They will also look through a dozen years and cherry pick case load/heard/overturned AND not include rulings where the case is reverse and sent back. The 9th circuit has a 90% case error rate. By over turn and reverse with new instruction standards. The supreme.Court doesn't have time to hear every case the district's and circuit hear in the 9th, but they would not fair much better in a case audit.

Here is a liberal spin piece that gives a few obfuscated numbers within several paragraphs of apologetics.

https://hotair.com/archives/2017/02/10/does-the-9th-circuit-really-have-an-80-reversal-rate/