I know this really isnt a RPG but i need help and im sure some one
has it.

Im in the mission where you take the cubans to do a gang war with the hatians, you kill like 5, then a sniper pops up. How do i get by the sniper and kill him?

Snipe him first.

Take the sniper rifle, then run behind the wall and he’ll lose focus of you. Come out after a bit and take a shot at him.