"The First Amendment ensures the right to assemble for everyone and the permit process is in place to allow for planning, to minimize disruptions and to create basic safety measures," San Francisco Rec & Parks spokesperson Tamara Aparton told SFist.
"The San Francisco Police Department will be implementing all safety measures for this event."
Despite the free speech rally being canceled, police determined that the conservatives in the area were in danger after the riotous horde tried to knock down the barricades and threw glass bottles.
San Francisco police said counter-protesters threw "plastic bottles filled with unknown liquid," metal cans and eggs at rally participants.
The San Francisco Police Department said six people were injured, including three officers who suffered non-life-threatening injuries when they were assaulted with pepper spray and caustic chemicals.