It's quite well done and for Hollywood it's pretty accurate historically speaking. Joe Kenahan was descendent for the Molly Maguires, Sid Hatfield was part of Hatfield Clan of the Hatfield/McCoy feud. This skirmish led to the battle of Blair mountain and then President Harding had to call out federal Troops to get between the miners and the state militia, Baldwins and local sheriff's deputies.
What does just crack me up no end is you get these ultra left wing types attacking the Tea Party as "Rednecks". How stupid! they have no idea that the striking miners at Blair Mountain all wore Red Bandana's to hide their faces and the local newspaper called them Rednecks. To me no greater honor then to be called a redneck as to me it means I'm a guy who stands up and strikes a blow for Liberty whether it be economic or social.