What group is summoned to investigate crimes and inform on matters within its jurisdiction?

The group that is summoned to investigate crimes and inform on matters within its jurisdiction is a Grand Jury. A Grand Jury is a legal body empowered to conduct investigations into potential criminal activity. They have the authority to examine evidence presented by the prosecution, call witnesses, and determine whether there is enough evidence to indict a suspect. Their role is crucial in the criminal justice process, as they ensure that charges are only brought forward when there is sufficient basis for them.

The functions of a Grand Jury differentiate it from other entities like a Fugitive, which refers to an individual who is attempting to evade law enforcement. A General Agent is a term typically associated with someone who has broad authority to act on behalf of another party, usually in a business context, and does not specifically relate to criminal investigations. Fieri facis, or "fi. fa.," is a legal term relating to a type of court order for enforcing a judgment, which is unrelated to the investigative role of a Grand Jury. Thus, the Grand Jury's unique position and purpose in the legal system make it the correct answer in this context.