[How can I block someone from following me?]

Thank you all for your feedback!

[How can I block someone from following me?]

I recently asked strangers to move their love making off my property, and they left promptly.  However, moments later I received a notice that one of them is following me!  I did not give permission for them to do this and find it a bit creepy.   What do they see when following me? Can I block them from following me?

Many thanks!