Threats are malicious statements used by one person to put another into a state of alarm, distress, or fear. Threats differ from warnings in that a threat is a hostile statement backed up with a high level of probability that the threatened action is genuine and intended to do grievous harm. Threats are adversarial in nature.
Warning is intended to put another person to a state of awareness that harm is imminent and what to do to mitigate the harm. Warning is non-adversarial in nature.
Extortion is the threat of harm if the person threatened does not perform some act or deliver some good or service. It can be material goods or sexual favors: the law makes no distinction in that regard.
Slanderous extortion is the threat that one person will defame another unless some goods or sexual favors are rendered: e.g. the town gossip will circulate rumors that will put you out of business if you do not do as directed.
Libelous extortion is the threat of adversarial publication if the other does not perform in a stated manner. While the information printed and published may be accurate, it is also damaging and intended to extort another person.
For example, threats of harmonica playing are not sufficient cause for legal action: one would actually have to put said harmonica to his lips and make a sound, to justify removing the harmonica from his rubbery lips and jamming it up his other end. Sideways.
The abuse of accordions may also justify the treatment, but may be somewhat more difficult for the proctologist to remove, as satisfying as it may be!