The Communist Party in the Tradition of the Left is a comprehensive journey through our party's rich history, born out of the pivotal moments of internal strife that defined our path. It emerged as a response to the significant splits that shaped our trajectory. It all started with the schism in 1951, followed by the emergence of a separate organization aligned with "Il Programma Comunista," and culminating in the tumultuous 'dirty' split of 1973. These events are the backdrop against which this text was written, tracing the evolution of our party's core principles and our steadfast dedication to revolutionary Marxism. This book serves a dual purpose: firstly, it acts as a meticulous historical record, chronicling our passage through turbulent times marked by ideological shifts and organizational transitions. Secondly, it underscores our resolute dedication to preserving the essence of our party-the unique program that has guided us for decades. Through this exploration, we aim to offer readers profound insights into our party's history, characterized by an unwavering pursuit of doctrinal unity and continuity, regardless of the challenges we have faced. This book is more than a historical account. It's a manifesto for a new generation of readers, a testament to the enduring strength of a party that seeks to shape the future. It calls for the study of Marx and Lenin, those luminaries who have guided the party's course throughout history. This work is a call to action, a rallying cry for the preservation of the revolutionary spirit.