vexatious action BrE , auch: vexatious litigation

The Administration of Justice Acts and the Act to protect Justices from Vexatious Actions, 2nd ed.

The concept of vexatious litigation entered into law in 1896 with the Vexatious Actions Act, enacted in England and soon extended to Scotland and Ireland.

Although it is unseemly that the law should protect the publication of malicious falsehoods, absolute privilege is justified on the practical ground that without it, persons with a public duty to speak out might be threatened with vexatious actions for slander and libel.