Counterfeit goods are not just media/entertainment/online content. Many of the organizations in support of the bill are brand-name manufacturers whose goods are easily counterfeited in other countries.

AFL-CIO members could argue that SOPA/PIPA would allow the AG to block foreign sites that sell counterfeit goods, thereby forcing individuals to buy the "official" goods domestically (where they would be manufactured by American labor). Granted, I don't know if there are any brand-name manufacturers still making their goods in the U.S., but that would be the obvious argument to my eyes.