Who were trade skeptics in 1993?

Dan Drezner writes :

Go back to NAFTA. Kevin is right to point out that the agreement’s efonomic effects were not terribly large. On the other hand, even skeptics of trade liberalization — Dani Ro[d]rik, Paul Krugman, and Joseph Stiglitz — supported NAFTA because it locked Mexican economic reforms, promoted political reforms, and cemented a stronger bilateral relaionship.

What? Paul Krugman was a trade skeptic in 1994? And did Joe Stiglitz voice an opinion on NAFTA at the time?

Krugman: Not an ounce of economic skepticism in pieces like this one from November 1993.

Stiglitz: When did he talk about NAFTA before 1999?