The family-owned company that operates The Pittsburgh Post-Gazette said on Wednesday that the newspaper will cease publication on Sunday, May 3, signaling the end of a publication whose origins date to 1786. The company, Block Communications, said it had lost more than $350 million over the past 20 years while publishing the newspaper. In a statement, it said the financial pressures facing local journalism had made “continued cash losses at this scale no longer sustainable.” The company cited recent court decisions that required The Post-Gazette to operate under the terms of a 2014-17 labor contract, which it described as imposing...