As a consequence of the economic problems faced by the People's Republic of Poland, problems with the growing social discontent regarding the current situation were more and more frequently encountered all over the country. The waves of strikes which were initiated at the beginning of the 80s and then suppressed by the imposition of Martial Law, were intensified. As well as economic proposals, slogans regarding the restoration of the legality of the social movement called Solidarity (full name: Independent Self-governing Labour Union "Solidarity”) also began to appear. In the situation of the growing crisis, the Communist authorities decided to start talks with the opposition groups. For this purpose, the decision was taken to commence Round-Table discussions where both the ruling Communist party and the opposition worked together to develop a programme for state reforms. The discussions were held from February till April 1989, and their result was, among other things, the decision to conduct partially free elections in Poland. The result of the elections held on 4 June 1989 was that the society was strongly in favour of the election of candidates who were independent of the Polish United Workers' Party, which allowed for the filling of all parliamentary seats to which the authorities agreed (35%). The government of the People’s Republic of Poland was headed by the first post-war non-Communist prime minister - Tadeusz Mazowiecki. On 29 December 1989, the Sejm amended the constitution and changed the name of the state to the Republic of Poland.