Corruption in public procurement is the misuse of entrusted powers for personal gain during the process of procurement of goods and services by various state owned enteprises. A politically connected company is one in which the owners, directors, business friends or family are politically active. The aim of this paper is to provide an overview of economic empirical research on the topic of public procurement, corruption and political connections, which were published in journals indexed in the Web of Science database. The mentioned researches were used in the bibliometric analysis, the result of which are five different networks: citations over time, co-citations, bibliometric coupling, co-authorship among countries and the occurrence of key words. Two tables were made: identified previous systematic literature reviews and the ten most cited researches. Authors use different approaches and methods to determine and measure the existence and extent of corruption, public procurement and political connections. Corruption can be measured by a survey that examines the perception of corruption, or project execution can be observed through financial data, progress reports, images and other relevant information about public works. Public procurement measuring is practically done by measuring the size, i.e. the amount of the public procurement contract, or it can be determined whether the company received a public procurement contract or not. Measuring of political connections requires determining the political affiliation of the company's leaders, and a company is considered to have political connections when one of the company's major shareholders or leaders is a member of parliament, the prime minister or the president of the state, or has a close family relationship with one of the influential politicians. Research results in Croatia showed that politically connected companies have 35% higher revenues from public procurement compared to those companies that are not politically connected. In public procurement tenders in the construction sector in the Republic of Croatia, almost 65% of the value of all public procurement contracts goes to politically connected companies. Numerous measures have been used to prevent corruption and improve the public procurement process. Combining the effects of the supervision of various citizen associations with electronic procurement and framework agreements could be effective measure for improving the public procurement process.