Depends on what they do... I was walking in Las Vegas and private security started following me in a vehicle. I ignored them and kept walking. They followed me

Depends on what they do... I was walking in Las Vegas and private security started following me in a vehicle. I ignored them and kept walking. They followed me for several blocks, driving very slowly right behind, and occasionally severing at me. I recorded them and called 911. The police showed up right away. The police had a long chat with the private security about public spaces and intimidation.