Original KGB

The KGB sometimes referred to as the "Russian Secret Police" existed from 1954 - 1991. Here is a link to a webpage which lists the organizations before the KGB as well.

KGB History

Microsoft's Encarta has an excellent detailed entry about the KGB

KGB Encarta Article

Many of the roles of the KGB are now filled by a new organization called the FSB (Translated as: Federal Security Service.)

FSB Official Homepage