Something controversial and political

Fiction okay? Ursula K Le Guin: The Dispossesed. 

Here’s a bunch of socialist/communist and anarchist theory, none of them are longer than 200 pages;

Communist Manifesto – Karl Marx

Socialism Utopian & Scientific – Friedrich Engels

Value Price & Profit – Karl Marx

Wage Labor & Capital – Karl Marx

What is to be Done? – V.I. Lenin

State & Revolution – V.I. Lenin

Imperialism the Highest Stage of Capitalism – V.I. Lenin

The Origin of the Family, Private Property, & the State – Friedrich Engels

The Principles of Communism – Friedrich Engels

Dialectical & Historical Materialism – Joseph Stalin

Anarchism or Socialism? – Joseph Stalin

The Conquest of Bread – Peter Kropotkin

Mutual Aid – Peter Kropotkin

Fields, Factories & Workshops – Peter Kropotkin

Below are a list of books that should certainly challenge your world view;

The Long Haul – Myles Horton

Blackshirts & Reds – Micheal Parenti

The Color of Law – Richard Rothstein

Everybody Lies – Seth Stephens-Davidowitz

Empires Workshop – Greg Grandin

Washington Bullets – Vijay Prashad

Killing Hope – William Blum

The Jakarta Method – Vincent Bevins

The Wretched of the Earth – Franz Fanon

The New Jim Crow – Michelle Alexander

Caste – Isabel Wilkerson

Stamped From the Beginning – Ibram X. Kendi

The Flowering Wand – Sophie Strand

Try A People’s History of the United States, by Howard Zinn. I don’t necessarily agree with all of his opinions, but his book is a take on history from the perspectives of people who are usually left behind.