The "Occupy Wall Street" demonstrations against capitalism have morphed into police controversies with the arrest of about 700 people on the Brooklyn Bridge last Saturday and the Union Square pepper-spray incident the weekend before. But the ongoing occupation of Zuccotti Park—dubbed "Liberty Square" by the protesters—in the financial district remains the center of the burgeoning protest and raises interesting constitutional issues about New York City's ability to control activity in the park, including protesters sleeping there.