Read "The Republic" by Plato for free. A classic public domain work covering classical literature, justice -- early works to 1800, political science -- early works to 1800. Available in full text from Project Gutenberg.
Classical literature
Justice -- Early works to 1800
Political science -- Early works to 1800
Utopias -- Early works to 1800
This book is in the public domain. Free to read and download from Project Gutenberg.