Threatening letters are written communications that express an intention to cause harm or distress to an individual or group. These letters can be sent through traditional mail or electronically and often contain aggressive language, demands, or warnings. They may be used in various contexts, including personal disputes, extortion attempts, or harassment. Receiving a threatening letter can lead to serious emotional distress and may require legal action. Victims are encouraged to report such letters to law enforcement, as they can be considered a form of harassment or intimidation. Authorities can investigate the source and take appropriate measures to ensure safety.