https://wccftech.com/fallout-76-factions/

Factions have always been a key part of Fallout, and the upcoming Fallout 76 will be no different. It isn’t 100 percent clear how factions will work, as Fallout 76 doesn’t have any human NPCs, but, presumably, players will somehow be able to pledge their allegiance to various groups.

Over the past few days Bethesda has been detailing Fallout 76’s factions on Twitter. These include new factions the Free States (a bunch of doomsday prepper types) and the Responders (former police, firefighters, and paramedics).