The article analyzes the work of the renowned sociologist and political scientist Nikos Poulantzas, who adhered to left-radical views and sought to reinterpret Marxist theory through the ideas of political sociology. The main works of the author are analyzed, focusing on the key issues addressed by the scholar, such as political regimes, the crisis of the state, transitions to new political regimes, and state legal regulation. From a methodological perspective, the article justifies a new approach to contemporary historiography and its role in the history of political and legal theories. By analyzing Nikos Poulantzas's scientific legacy, the author concludes that the scholar highlights class affiliation and the role of the state in the legal regulation of relationships and interactions among various classes; in this context, the independence of the state is largely determined by the content and intensity of political struggle within that state. The methodological foundation of the research is based on a system of modern general scientific and private legal methods, employing the following general scientific methods: analysis and synthesis, abstraction and modeling, observation, generalization, description, classification, and more. In addition to the methodological aspects, the novelty of the research lies in the clarification of some basic provisions of Nikos Poulantzas's legal concepts regarding the state and law, and his significance in contemporary research in the fields of philosophy, theory, and history of the state and law. The political and legal thought of Nikos Poulantzas represents a departure from classical Marxism and socialism; the scholar pays special attention to: political regime and its changes; political crisis and its consequences; law and its properties. In domestic legal philosophy, theory, and history of the state and law, scholars have frequently referred to the works of Nikos Poulantzas; however, the author's teachings have not been fully explored but only mentioned in relation to certain topics of socialism and Marxism.