Fred Hampton The Leader Of The Illinois Chapter Of The Black Panther Party And Mark Clark Were Killed In A Raid By Chicago Police Officers In What Many Scholars Consider An Illegal Assassination 1971 The Troubles The Ulster Volunteer Force An Ulster Loyalist Paramilitary Group Detonated A Bomb At A Catholic Owned Pub In Belfast Northern Ireland Killing 15 People 1978 Following The Murder Of Mayor George Moscone Dianne Feinstein Became San Francisco S First Female Mayor - December 4 in History | This Day Story