Which action would classify as stalking?

Following someone without their knowledge is considered stalking because it involves a persistent effort to monitor or track a person's movements without their awareness or consent. This behavior creates a sense of fear or anxiety for the individual being followed, as they are unaware of the observer's intent. Stalking typically involves a pattern of behavior intended to harass or intimidate someone, and following someone surreptitiously clearly fits this definition. It can escalate feelings of being threatened, which is a core aspect of stalking laws.

In contrast, sending gifts or calling someone periodically may not necessarily imply a threatening situation unless further context indicates otherwise, such as if the person feels harassed or does not want contact. Similarly, making uninvited visits can be intrusive but does not inherently involve the consistent, covert nature that defines stalking, particularly if the visits are sporadic and not aimed at harassing. Therefore, the action of following someone without their knowledge aligns closely with the behaviors outlined in stalking legislation.