This Gianna mission centers around protecting her career. A Disciple called Kilo found out about the illegal operations Gianna has been running from before and know has told a federal prosecutor. Angel doesn't like working for someone at the feds, but the money is good, so who cares? We need to make sure the prosecutor doesn't take this any further.
First, head to the prosecutor's villa. Upon arrival Kilo and some of the Disciples will be waiting for you. They aren't too hard to deal with, and after they're down, the prosecutor makes a run for it. You need to use your climbing skills to follow him across the rooftops, starting with the crates near the villa. He can't run too fast and gets tired easily, so it's not too difficult. Once you locate him, beat him up and he'll hand over the documents he has about Gianna.
Gianna then gets on the phone saying how she owns us and that we work for her! Our answer to that is to post the documents that the prosecutor had right into the DICS headquarters, so head there now.
All you have to do is walk into the arrow to post the documents and complete the mission.
Reward: 7,500R$
The game crashes every time I beat up the prosecutor. Is this a known bug? I can't get anywhere in the game until I get past this glitch.