U.S. employers likely stepped up hiring only slightly in May, a sign the economy was growing modestly but not strongly enough to convince the Federal Reserve to scale back the amount of cash it is pumping into the banking system. The United States probably added 170,000 jobs last month, with the unemployment rate holding steady at a lofty 7.5 percent, according to a Reuters survey of economists. Following a winter in which the economy seemed to be turning a corner, May would be the third straight month that payrolls outside the farm sector increased by less than 200,000. "The labor market may not be as strong as we ... (full story)