In a rare step, the California Supreme Court has blocked Gov. Jerry Brown’s attempt to issue a pardon to a 37-year-old Cambodian refugee who killed a woman when he was 14 years old. The court gave no reason for the rejection, but earlier noted it only had the authority to do so in the case of an “abuse of power.”Brown’s pardon would have effectively stopped Borey Ai’s deportation to Cambodia, a nation where his mother was born but he has never seen. The governor in the last 10 months has pardoned seven ex-convicts who otherwise faced the threat of deportation...