Gaius Porcius Cato was a client (an adherent) of triumvir Marcus Licinius Crassus and was an ally of Clodius (Publius Clodius Pulcher) the infamous Patrician tribune of the plebs, in his street gang war against Milo (Titus Annius Milo).
He attacked Publius Cornelius Lentulus Spinther and Gnaeus Pompeius Magnus (Pompey the Great) in 59 BC by prosecuting a follower, Gabinius, for ambitus (political corruption) but was thwarted by a Pompeian praetor and was chased from the rostra by an angry crowd.
Cato served as a plebeian tribune himself in 56 BC, and in his political activities, he was usually associated with his colleague Nonius Sufenas.
The following year, after his tribunate, Cato and Sufenas were both accused of procedural violations.
Although Cato's prosecutor in the trial was the future Caesarian historian Gaius Asinius Pollio (consul 40 BC) they were both acquitted.