Want to Occupy Harvard? Go ahead, but only if you have a valid student ID.

On Wednesday evening, around 350 protestors — including members of the Harvard community — staged an on-campus protest to demonstrate their solidarity with the Occupy Wall Street movement and to show disapproval of the University’s “perceived complicity in growing income inequality across the country,” the Harvard Crimson reported.

As time passed, security increased. Eventually, security measures prevented protestors without Harvard affiliations from entering the Yard. Around three hours later, after marching throughout campus and attempting to relocate the protest, a smaller group of Harvard students began to construct a tent city to facilitate their occupation. Suzy M. Nelson, Dean of Student Life, ultimately permitted the group to set up camp outside of Harvard’s University Hall.

Due to the presence of the camp, security on the Harvard campus has increased. In a message to the Harvard community, Provost Alan Garber and Executive Vice President Katie Lapp explained these new security measures: among other changes, no one will be permitted to enter Harvard Yard without a valid ID.

“Securing access to the Yard is necessary for the safety of the freshmen and others who live and work there, for the students who will be sleeping outdoors as part of the protest, and for the overall campus,” the message explained.

This isn’t the first time the Occupy movement has hit Harvard’s campus. Harvard students in favor of the Occupy movement have been heading down to the protest’s Boston incarnation for a while. On Nov. 2, Harvard saw an “Occupy Speakout,” during which some students of an introductory economics course staged a walkout, protesting what they believed to be the course’s biased overview of economic theory.