The Federal Undercover Agency (FUA) began during the end of the Seven Years War (1756-1763). Britain and France determined a truce, along with the other involved parties during the signing of the Treaty of France. They determined that to prevent a similar war, they would establish an agency that would be able to investigate uninhibited into matters of European distress that regularly they would have no just cause, and be able to act when signs of war were upon them.
The FUA gained traction during World War 1 (WW1), when several countries, including Canada and the United States, joined. They recognized the benefits of an agency who followed their own set of rules outside of government guidance. The FUA Board is the highest of officials; they oversee that the FUA Branches and agents do not overstep into CIA, FBI, Military and Interpol jurisdictions. When the United Nations (UN) was established, the FUA Board became directly accountable to only them when a Branch or agent steps out of line.
The FUA is considered a last resort for countries to eliminate threats or resolve conflict without leading to war. It tends to be specialized, covert assignments to absolve any one country's involvement, and prevent retaliation in political affairs.