A team of researchers at the Federal Reserve are pointing fingers at more than a handful of states they say are actively undermining the government's attempts to curb income inequality. According to a new paper, the federal tax code works to compress income inequality across the U.S., a problem that has been growing since 1980. The general idea is that high earners should be taxed at higher rates, allowing a good portion of that revenue to go into programs that help lower-income people. In contrast, some states have instituted "regressive" tax policies that offset federal taxes and widen the growing...