To Harass

1. To annoy (someone) frequently or systematically; to pester. Synonyms: beleaguer, beset, chevy, harry, hassle, molest, plague
   1. (specifically) To persistently bother (someone, or a group of people) physically or psychologically when such behaviour is illegal and/or unwanted, especially over an extended period.
2. To put excessive burdens upon (someone); to subject (someone) to anxieties.
3. To trouble (someone, or a group of people) through repeated military-style attacks.
4. (obsolete) Often followed by out: to fatigue or tire (someone) with exhausting and repeated efforts.