A man who formerly lived in Quincy has been indicted for obstructing a federal investigation into his younger brother’s role in setting fire to three Jewish community institutions in 2019, according to the U.S. Department of Justice . Alexandar Giannakakis, 35, is charged with making false statements in a matter involving domestic terrorism; falsifying, concealing, and covering up material fact in a matter involving domestic terrorism by trick, scheme, and device; and concealing records in a federal investigation, among other charges. Giannakakis’s younger brother, who was the primary suspect in the string of arson cases in which someone set fire...