reds is a film completely outside of the epic drama genre
 history  ancient sources providing a plethora of narrative tropes the mesopotamian epic of gilgamesh as the first recorded epic poem would lay the foundation for the entire western branch of the genre
 the difference between a docudrama and a documentary is that in a documentary it uses real people to describe history or current events in a docudrama it uses professionally trained actors to play the roles in the current event that is dramatized a bit