The OSS (Organization of Super Spies) is a American based international espionage and defense agency run by spies that counteracts the ambitions of enemies around the world. They ran a Spy Kids division, that would operate younger agents on missions in the field but it was shut down due to budget cuts for seven years. However, Juni and Carmen Cortez reopened it and became the heads of it.
Spy Kids 2: The Island of Lost Dreams
Spy Kids 3: Game Over
Spy Kids: All the Time in the World
The name, OSS, is a reference to the American intelligence agency that preceded the CIA during World War II, the OSS (Office of Strategic Services).
Additionally, in the Spy Kids Adventures books, the OSS is called by its real-life name, Office of Strategic Services.