Ken Levine takes Game Informer through the setting of BioShock Infinite, detailing the civil war that is tearing the city of Columbia apart and the factions the player will have to deal with.
As the ultranationalists ramp up their extremist message of god, guns, and liberty, a protest group forms in response. This group, known as the Vox Populi, wants to out-shout the Saltonstalls of the world and extend the freedoms of Columbia to all its citizens, no matter their race or creed.
(This group starts out as a confederation of like-minded people,) Levine says. (As it becomes more serious and more organized, there becomes a need to enforce an ideology, an order, and a hierarchy. As the group becomes more organized over time, it also becomes more brutal. There becomes a line to toe. Different leaders emerge and some leaders aren't as successful as other leaders, and you can imagine what happens to them. They get pushed aside and a unified ideology comes into place.)
Since none of its members made an appearance in the game demo, much less is known about this group. We do know, however, that Vox Populi is a Latin term that translates to (voice of the people,) and this group likely clings to concepts like the Statue of Liberty's famous inscription: (Give me your tired, your poor, your huddled masses yearning to breathe free.)