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Archer and Daniels in the Temporal Observatory.
The Temporal Accord is an interstellar treaty regarding time travel, similar to Starfleet's Temporal Prime Directive. When time travel was first developed, all the major temporal powers agreed it would only be used for research. Some factions broke the accord, initiating the Temporal Cold War. Unnamed powers such as those represented by the individual informally known as Future Guy fought with proxies such as the Suliban Cabal, the Tholians, and the Tandarans . Others, able to travel themselves sent Temporal agents like Crewman Daniels. (ENT: "Cold Front", "Detained", "Future Tense")
The Na'kuhl, a 29th century faction in the Temporal Cold War, were violently opposed to the Temporal Accord; they deemed time travel their innate right, going as far as assisting the Nazis in defeating their enemies to reach their goals.(ENT: "Storm Front, Part II")