Easy and very useful melee weapon, all you need to do is head over to Hubris Comics and as soon as you enter the room behind the counter (in front of) is a case that is locked. I believe the case is expert so you need a high lockpicking skill but just pick the case and the axe is yours!

Axe, hits cause stagger enemies take bleed damage

heres where to find it, its to the right of diamond city!
[ Register or Signin to view external links. ]