The topic of this diploma paper is the Snowden case. Edward Snowden is the most famous whistleblower and former employee of the CIA and the US National Security Service. The aim of this paper is to analyze the Snowden case and to refer to the topic of whistleblowers in general, as well as the analysis of legal regulations aimed at the legal protection of whistleblowers. After a short introduction, in this paper will be discussed the legal protection of privacy with the focus on regulation in the US. Furthermore, it will be mentioned the “Umbrella Agreement” which was concluded with the aim of establishing a comprehensive framework for data protection in the activities of criminal law authorities. It is essential to mention the General Data Protection Regulation and it will be shortly analyzed in the part where it is necessary for the understanding the topic of this diploma paper. Of course, there will be a mention of the Constitution of the Republic of Croatia as well as the European Convention for the Protection of Human Rights and Fundamental Freedoms. Then is going to be written the definition of whistleblowers, as well as the types of whistleblowers. The literature divides them into internal and external, which will be written about in more detail later. Following on from that, the topic of whistleblower protection in the USA will be covered, but there will also be a review of the protection of whistleblowers in the Republic of Croatia. After this paragraph it is going to be written about core of this work, Edward Snowden , who he really is, how it came to be that almost everyone knows his name, about secret documents that, thanks to Snowden, came to the public even though they should never have. Also there is going to be mentioned the key programs XKeyscore, PRISM and BOUNDLESS INFORMANT. This work aims to draw attention to the importance of protecting personal data of each of us, but above all to the practical realization of the rights that have been guaranteed to us for decades, of course on paper.