The Temporal Integrity Commission exists in the 29th century. Armed with equipment which can scan time, they look for any temporal anomalies, and make efforts to correct them. Captain Braxton and the timeship Aeon were sent to Earth in 1996 to return the USS Voyager back to the Delta Quadrant in 2373 at the request of the TIC. (VOY: "Future's End, Part II")
The Federation Timeship USS Relativity had connections to the Temporal Integrity Commission. (VOY: "Relativity")