The study is devoted to the development of Czechoslovak labour legislation in the second half of the last century. It traces the form and practical application of the basic legal norm – the Labour Code from 1965. It points to the economic and political causes of the most important changes and the impact of the adopted measures on the application of the code in practice. Apart from all the unrealized projects from the period of the renewal process and the post-November legislation, the study directs its attention especially to the characteristics of the three main amendments to the Labour Code during the Normalization period, which the author designates as the normalizing (1969), amending (1975) and reforming (1988) changes. The author endeavours to observe that the development of the legal norms connected with the labour process, the motivation for introducing particular amendments, problems with the implementation of some ideas, conflicting views and difficulties with the application of some adopted measures significantly contributed to the atmosphere of the time. These problems reflected the individual phases of the development of Czechoslovak or Czech and Slovak society in the second half of the last century.