It’s not just fat cat hedge funds, banks or Wall Street investment companies that benefit when U.S. companies cut their tax bills by moving their headquarters overseas via mergers with foreign concerns. More than a dozen state government pension funds that run retirement accounts for government workers like teachers, cops and firemen own big chunks in these “corporate deserters,” too. Five U.S. companies merging with overseas concerns have big state government pension investments amounting to nearly $2 billion, based on data provided by Richard Peterson, senior director at S&P Capital IQ. But you don’t hear about government pension investments in...