The lived in public parks for days as part of their protest. They could do this because they were expressing their opinions. Like symbols, protest is considered a form of speech. However, as with other forms of speech, there are limits on political protest. Protestors cannot stop other people from doing what they want to do, such as going to work or to schools. They cannot block public streets or buildings. They cannot prevent businesses and offices from operating. They may not cause harm to the health and safety of others. The police ended some of the Occupy protests for these reasons.