stephen a. barnes is the author. first of all, professor barnes, what is a gulag? >> guest: the gulag is -- in short -- well, it has two meetings. it's an acronym for a bureaucratic institution. but, of course, it's been used much more generally to mean primarily labor camps, but also a system of interimly-exiled people and some prisons as well. in the large part, we're talking about the soviet penal system, but also a system that held political prisoners in the soviet union. >> host: when and how were they developed? >> guest: the first lay wore camps -- labor camps start very early in the soviet period. lenin himself talks about the need to put the enemies of the revolution into concentration camps. and they start playing around after the revolution in 1917 with ideas of using no, forced r at various economic projects, but also using labor as was common in penology at this time as a method of trying to reform or transform criminals. but the real expansion of the gulag to what we kind of know it as, this huge, multimillion prisoner institution, really waits for th