What is a group of people called together to decide an issue at law?

A group of people assembled to make a decision on an issue at law is referred to as a jury. In a judicial context, juries are tasked with reviewing the evidence presented during a trial and rendering a verdict based on that evidence. This process is a fundamental part of the legal system, especially in criminal and civil cases, where the jury's role is to ensure a fair assessment by a group of peers.

The other options do not fit this definition: "mandate" typically refers to a formal order or command, "liability" relates to being legally responsible for something, and "writ of mandamus" is a court order compelling someone to execute a duty that they are legally obligated to complete. None of these terms encapsulate the collective decision-making function that a jury performs in legal proceedings.