A Federation judicial body before which Quark was summoned to give evidence in 2373, prompting the ill-fated runabout journey with Odo that ended in a crash on a frozen planet.
A Federation Grand Jury is a panel convened to hear evidence in serious criminal matters. One is sitting on Inferna Prime in the Deep Space Nine episode The Ascent.
Odo collects Quark for the eight-day trip with evident satisfaction, letting him believe he is finally to be charged with something. In fact Quark is wanted as a witness in a case involving the Orion Syndicate. The Syndicate has hidden a bomb aboard the runabout, and the damage forces a crash landing on a barren, freezing world.
With the communications gear wrecked, the two old adversaries must haul a transmitter up a mountain to call for help, quarrelling all the way, and Odo, newly solid, breaks his leg. Quark finishes the climb alone and both are rescued by the Defiant.