Brother of Dead Suspect in Fires at Boston-Area Jewish Institutions Pleads Not Guilty

BOSTON—The brother of a man suspected in four arsons involving Jewish institutions in the Boston area in 2019 pleaded not guilty in federal court Thursday to charges that he obstructed the investigation. Alexander Giannakakis, 37, formerly of Quincy, Massachusetts, was working in security at the U.S. embassy in Stockholm, Sweden, when he was arrested by Swedish authorities in 2022. He was recently extradited. Mr. Giannakakis is due back in court on Feb. 22. Mr. Giannakakis’ brother was hospitalized in a coma at the time he was identified as a suspect in February 2020, and he died that year. Federal authorities did not name him....