Mark Childress (born 1957 in Monroeville, Alabama) is an American novelist and Southern writer. (wikipedia)
Most of these situations are handled at patrol level and include phone harassment or letters and notes that are mostly just annoying in nature, ... But when it elevates to following in public or violating a restraining order it can become a felony.
Stalking is an extension of harassment elevated to a level where it is causing disruption or physical threat to the person being harassed,