A new study is challenging the Obama administration’s claims that Colombia’s handling of the killings of labor activists has improved and warrants congressional approval of a long-delayed free trade deal. Human Rights Watch says there has been “virtually no progress” in convicting those who have killed labor activists in the past four-and-a-half years. Of 195 killings handled by a special prosecutor between January 2007 and May of this year, just six resulted in convictions.