The Cardassian Intelligence Bureau was the intelligence agency of the Cardassian Union that replaced the Obsidian Order in 2371. The Bureau continued to operate under the Jem'Hadar when the Cardassians joined the Dominion.
Alon Ghemor became the leader of the Intelligence Bureau upon its creation. (DS9 novel: The Never-Ending Sacrifice)
In 2374, Elim Garak, when captured by Keevan's Jem'Hadar troops, claimed to be a member of the Cardassian Intelligence Bureau and thus an ally. (DS9 episode: "Rocks and Shoals")
In 2381, the Cardassian Intelligence Bureau sent Neta Efheny undercover to Ab-Tzenketh. (ST - Typhon Pact novel: Brinkmanship)
In 2385, Prynok Crell was the head of the Cardassian Intelligence Bureau. (ST - The Fall novel: The Crimson Shadow)