A former Quincy man has been arrested in Sweden, as the feds charge him in connection with the investigation into four fires set at Boston-area Jewish institutions. Alexander Giannakakis, 35, was arrested by Swedish authorities in a Stockholm suburb at the request of the U.S. Giannakakis has been indicted by a federal grand jury in Boston for allegedly obstructing the arson investigation at the Jewish sites in Arlington, Needham and Chelsea, according to the U.S. Attorney’s Office. His younger brother was the prime suspect in the investigation into the four fires that had been set at Jewish-related institutions in the...