population, known as the Ústí massacre, mostly at the hands of out-of-town paramilitary groups. Whilst the official investigation blamed the explosion on German saboteurs, more recent historical work points towards it being a communist provocation, intended to effect the subsequent expulsion of Germans. Between 80 and a thousand people died in the event, with estimates varying widely, but being generally much higher than the official body count. The knowledge of the event has been almost entirely suppressed by the communist authorities and so it remains mostly unknown to Czechs. Under the terms of the Potsdam Conference and the Beneš decrees, the city was restored to Czechoslovakia and almost the totality of its previous population expelled as being German. In May 1948, the Communist government passed a new constitution declaring a people's republic. Communism continued until the 1989 fall of the Berlin Wall set off a series of events which are now known as the Velvet Revolution. Today, Ústí nad Labem is a major industrial city of the Czech Republic with substantial chemical, metallurgical, textile, food, and machine tool industries. Matiční Street Wall The city gained notoriety in the late 1990s when a wall was constructed along part of the Matiční Street separating houses on one side from the tenement blocks on the other. Since the latter were homes mainly to Romani, it turned into an international scandal. Mayor Ladislav Hruška promised local homeowners' representatives that the wall would be finished by the end of September, 1998. Foreign journalists travelled to Ústí nad Labem to investigate, and were told by councillors that the wall was not meant to segregate by race, but to keep respectable citizens safe from noise and rubbish coming from the opposite side of the street. In September, city representatives announced that plans would be changed from a four-metre soundproof wall to a 1.8-metre wall of ceramic bricks, and a children's playground would also be constructed in front of the tenement blocks. Despite these changes, the Roma Civic Initiative and Deputy Prime Minister Vladimír Špidla vocally opposed the construction. The wall was criticised by U.S. Congressman Christopher Smith, and a delegation from the Council of Europe described it as a "racist" and drastic solution. The new plans slated construction to begin 30 August 1999, but a decision by the district office delayed the move because a wall that large would require a permit, and threatened to damage the