Shypunov H. Conceptualization principles of the ideological and institutional evolution of left-wing political parties.

The thesis has developed a complex methodological author’s conception for the research of ideological and organizational evolution of political parties. In the framework of methodological logic of the author’s research strategy on the study of the ideological and institutional evolution of political parties, the thesis has investigated the main directions of ideological and organizational development of the left-wing parties. In particular, the main stages of the formation of basic ideological principles and party institutionalization of the left political forces in the second half of the 19th century have been determined. The peculiarities of the formation of the socialist (social democratic) and communist parties have been established. The specificity of anarcho-syndicalism as an ideological and institutional alternative to the development of the left-wing movement in the format of political parties has been explored. The basic trajectories of ideological and organizational evolution of the communist and socialist (social democratic) parties in the 20th and 21st centuries have been established.