 Complete the following phrase:  In 1927, during a political clash in Schattendorf, an old man and a child were shot and killed by Heimwehr. On 14 July 1927 the shooters were acquitted and left-wing supporters began a massive protest during which the Ministry of Justice building was burned. To restore order police and army shot and killed 89 people and injured 600. The huge protest is known as the 