Is this a point of contact between Marxism and Heidegger?
Marx complains (bitterly) about exploitation by your - class - enemies
Heidegger complains about inauthenticity, which I might gloss as someone attempting to cheat you with fakery: an enemy, disguised as a friend, exploits you.
Do the two have the same ethical foil?
I think this is to ask whether the friendship of "das man" is false in the sense of others actively cheating you out of your individuality.