A former federal judge made the rare decision Friday to speak out against a Supreme Court Justice whose actions outside the nation’s highest court he characterized as “improper” and “dumb.” Judge Michael Posner, appointed to a Massachusetts federal court district by former President Bill Clinton, subjected Justice Sam Alito to harsh criticism over the upside-down flag reported to have flown outside his family home. “The fact is that, regardless of its legality, displaying the flag in that way, at that time, shouldn’t have happened,” Posner writes in a New York Times editorial. Want more breaki…