Dressed in black and carrying signs like “Defund the Police, Peduto is a coward,” about 150 protesters marched to Pittsburgh Mayor Bill Peduto’s home Sunday after rallying in Mellon Park in Point Breeze. Protesters were outraged by a “low-visibility arrest” of a protester in Oakland on Saturday during a Black Lives Matter protest. The arrest of 24-year-old Matthew Cartier came several hours into the protest in Oakland. Social media video shows police officers, not in uniform, emerge from an unmarked van and pull Cartier inside. Pittsburgh police Cmdr. Ed Trapp said that Cartier was blocking an intersection unnecessarily, stepping in...