The Starfleet Regulatory Agency was a branch of the Federation Starfleet.
In 2369, Starfleet brought the operations center of Deep Space 9 up to the standards of the Starfleet Regulatory Agency. (DS9 reference: Star Trek: Deep Space Nine Technical Manual)
Among the responsibilities of the Starfleet Regulatory Agency is the monitoring and regulation of electromagnetic field output of planetary installations. (ST - New Worlds, New Civilizations short story: "The Specter of Jamestown")