This is a Campaign idea I thought I would share.
The basic premise is super heroes first appeared in 1939 and at first the populace was grateful for their super powered guardians but after World War 2 ended the people began to feel uneasy about super humans. By 1949 most heroes had retired to settle down and raise families. But some heroes continued to fight. A group of heroes were approached by a man who introduced himself as Agent X; He suggested forming a covert team, and so the Bureau was created. The heroes were trained in covert operations and the organization grew until it became the premiere agency for dealing with paranormal crime.
The Bureau is now affiliated with the justice department and deals with paranormal crime, technology and phenomenon.
And while the founders were Super Heroes the current agents are merely skilled humans armed with high tech gadgets adapted from super hero weapons (lets face it super heroes had Jetpacks, ray guns, bullet proof cloth and invisibility devices back in the forties).
The PCs are Agents just out of the academy and have been scouted for an elite group that is just forming.