You easily find the memorial you were told about. Right across the street from it, you see a large neon sign that says "The Squeakeasy." It's surprisingly obvious for the main hideout of the revolution.
You push through the doors and find yourself in a lively, crowded bar. You don't immediately see where to go. You push through the crowd toward the bar, then spot a door near the back. A dangerous-looking guinea pig is standing guard next to the door, watching the bar's patrons with a critical eye. When you make your way towards them, they immediately spot you and manage to make themselves look like even more of a threat.
"You got business with us?"