FORTUNE -- As the economy continues to wobble, the American divide on labor rights is playing out in some unexpected locales. Indiana is in the spotlight now, as it prepares to adopt a law that unions say will weaken their ranks. If passed, the "right-to-work" law would allow workers to skip paying union dues but still receive the benefits of union-negotiated contracts. Advocates say such employees have been forced into unions, but organized labor calls them "free riders." Like the minimum wage, right-to-work battles have flared repeatedly for more than a half-century after workers toiling in onerous circumstances -- not unlike what some in Asian factories face today -- won the right to unite and bargain for wages and workplace conditions. But the nation never completely embraced a uniform view of worker rights.