Can you back your claims up? In particular, say, the Trans-Siberian railroad? Its construction began in 1891, two decades before the formation of the USSR [1].

While certainly prisoners were used in its construction, saying that it was "built with slave labor" is somewhat disingenuous. Perhaps you are saying that parts of it were built using prisoners, who were not paid for their services? If so, that is certainly the case.

1. http://en.wikipedia.org/wiki/Trans-Siberian_Railway#Construc...