Street Fight is a Side Mission in InFamous.
Description
A worried pedestrian will in form you that the Reapers and the Dust Men are "throwing down" (fighting) near the docks of the Warren. The fight is, obviously, quite violent, and because of this the pedestrian is afraid innocent lives will be lost. Cole is tasked to deal with it. The side mission will end when all enemies are taken down.
Strategy
This fight can be hard if you have not unlocked the higher tiers of some offensive powers, like the Shock Grenade and the Megawatt Hammer. However, the battle gets a lot easier considering that Cole is not the only opponent, as the factions will fight each other too.
To maximize the chance of beating all the bad guys, it can be smart to prioritize: Dust Men Conduits and Rocket Launchers have the largest priority, since they wield Rocket Launchers and quickly kill you off. On second, Reapers Conduits, and last, normal gang members.
Evil: Blow up the nearby gas station. There is one Dust Man Rocket Launcher on the roof, and the explosion is sure to kill several more enemies. The best result can be achieved by "luring" a flock of enemies against the station, and then blow them sky high.
Good: Use Good offensive abilities, like the Rocket Redirect tier of the Megawatt hammer (for accurate explosions), and the last tier of the Shock Grenade, which should give you fast Take Downs. Surfing on the nearby train track can give you an edge, by picking off enemies with Precision.
Exploits
It is entirely possible to keep this mission for the sake of farming XP. When you have nearly killed all enemies in the area, just jump off the pier and into the water. You will die and respawn where you started, but now, all participants in the fight are alive as well. You are able to gain at least 400-700 XP per try, making this a fast and easy way to get all upgrades early, even at the Hard setting.