During the study of the documents on the establishment and protection of the state border of Czechoslovakia and the Czechoslovak Socialist Republic, I have based myself on the literature and legal regulations in force and effective at the time of their use. I then drew indispensable information during consultations with my thesis supervisor. This thesis deals with the original control bodies of the past centuries that patrolled the borders, as well as the armed corps - the Financial Guard. It was established during the Austrian monarchy and continued its activities after the establishment of Czechoslovakia. The current borders of the Czech Republic are based on historical sources to which the Czechoslovak government referred when the Czechoslovak Republic was founded. Thanks to these efforts, we have the state borders as we know them today. However, the establishment of these borders was not at all easy, and at the very beginning of its existence Czechoslovakia had to make a military effort to maintain its borders. The greatest surveillance and protection of the borders took place during the 1930s, when the Czechoslovak Republic was preparing for a war conflict, which ultimately did not take place. The most important position was held by the Financial Guard, which in the event of a military conflict was...