Greenskins

(location): Greenskins is a Minutemen radiant quest in Fallout 4. This quest can be started randomly when speaking to Preston Garvey or listening to Radio Freedom. If a settlement hasn't been unlocked yet, this quest may be started by speaking to a settler at that location and it will unlock the settlement.

Failure to kill the targeted super mutant in a timely manner will result in the failure of the quest.

Quick walkthrough

 * 1) Speak to point of contact at settlement.
 * 2) Clear the super mutants at random location.
 * 3) Return to point of contact at settlement.
 * 4) If quest started with Preston or Radio Freedom, return to Preston Garvey.

Possible mutant-infested locations

 * Breakheart Banks
 * Faneuil Hall
 * Medford Memorial Hospital
 * Scrap Palace
 * Wilson Atomatoys factory

Bugs
Starting the quest from The Slog:
 * It will sometimes have the player go to Faneuil Hall and even if you kill all the mutants there the quest will remain incomplete.
 * If the player has previously visited Breakheart Banks, and killed the supermutants, the quest will not update past the "Kill the Super Mutants" entry. The quest marker will show and will update while killing the mutants, but the player cannot turn the quest in.
 * Roger Warwick will sometimes not trigger dialogue to clear out a random location, making the quest impossible to complete