"Crash a meeting organized by one of frank's lieutenants"
We need to take out one of frank's lieutenants, Mick Valente. He and some of his men are planning to take you out, so the idea is to do that to him before he gets the chance. Once Vera has finished explaining all of this to you, follow the waypoint to where Mick and his henchmen are waiting. The game will automatically put you in cover, at which point you can take your time eliminating the first five enemies.
After this, Mick will appear at the top of the stairs. He has a shotgun, but you will only be engaging with him at range, so he's not really a threat - especially as all his henchmen are dead. Avoid fighting him in melee combat
TIP: Every time you successfully land a shot on Mick, he will stagger, meaning he cannot fire a shot at you in return.
Reward: G50,000, Respect: 235,000