He conspired with Count Dooku to kidnap his nephew Jabba's son, Rotta, but the plot was foiled and he was imprisoned.
Fearing he would confess many of the Hutt Clan's dealings to the Republic, the other Hutts paid Cad Bane to break him out, so they could imprison him under their watch.
Jabba paid Ziro's lover Sy Snootles to break him out once more, so he could lead them to the location of the Hutt Council records he hid on Teth before killing him.
Before going to prison, Ziro imprisoned Galactic Senator Padmé Amidala after she arrived to discuss the Hutt's affiliation with the Sith Lord Count Dooku, however, C-3PO contacted Clone Troopers, who came and rescued Amidala. Cad Bane eventually broke Ziro out of prison by taking a group of Senators hostage, which coincidentally Amidala was a part of.
Bane used the hostages as leverage for getting a pardon disk from Supreme Chancellor Palpatine, which he passed through the Twi'Lek Senator Orn Free Taa.