The "Red judge myth"is, well, a myth. And Fillon's case was very clear and he had all the reason to be prosecuted.
And sure, belonging to a communist-leaning syndicate which publicly takes political stances (one being to say "dont vote for Sarkozy") has strictly no influence on how you deliver sentencing, nor does the famous incident "mur des cons" in 2013.
Your claim that the judges are red is a popular right wing fantasy