From Julius Caesar wiki
underline added.63 BC was an eventful year for Caesar. He persuaded a tribune, Titus Labienus, to prosecute the optimate senator Gaius Rabirius for the political murder, 37 years previously, of the tribune Lucius Appuleius Saturninus, and had himself appointed as one of the two judges to try the case. Rabirius was defended by both Cicero and Quintus Hortensius, but was convicted of perduellio (treason). While he was exercising his right of appeal to the people, the praetor Quintus Caecilius Metellus Celer adjourned the assembly by taking down the military flag from the Janiculum hill. Labienus could have resumed the prosecution at a later session, but did not do so: Caesar's point had been made, and the matter was allowed to drop. Labienus would remain an important ally of Caesar over the next decade.
the link 37 references this page.
I don't get the point. What was the point? Even the referenced page doesn't clarify it for me. Thank you any historical buffs that get it.