UPS CEO Rails Against Protectionism

"While trade can be a polarizing topic, expanding trade can benefit developed and developing countries alike," Ducker wrote.

FedEx Goes After UPS

"We cannot let the current economic challenges blind us to the benefits that world trade will continue to provide," he said. "We must stand against those who would undermine and tear down a global economy."

Meanwhile, World Bank President Robert Zoellick also condemned the protectionist rules in the U.S. economic stimulus package last week, calling them "mistaken actions."