Read on Twitter
Thread of leftist / radical books in .pdf (free!) 
Pedagogy of the Oppressed by Paulo Freire https://envs.ucsc.edu/internships/internship-readings/freire-pedagogy-of-the-oppressed.pdf
Are Prisons Obsolete by Angela Davis https://theanarchistlibrary.org/library/angela-y-davis-are-prisons-obsolete.pdf
Wretched of the Earth by Franz Fanon https://monoskop.org/images/6/6b/Fanon_Frantz_The_Wretched_of_the_Earth_1963.pdf
Assata by Assata Shakur
https://libcom.org/files/assataauto.pdf
https://libcom.org/files/assataauto.pdf
Wage Labour and Capital by Karl Marx https://www.marxists.org/archive/marx/works/download/pdf/wage-labour-capital.pdf
State and Revolution by Vladimir Lenin
https://www.marxists.org/ebooks/lenin/state-and-revolution.pdf
https://www.marxists.org/ebooks/lenin/state-and-revolution.pdf
Joyful Militancy: Building Thriving Resistance in Toxic Times https://theanarchistlibrary.org/library/joyful-militancy-bergman-montgomery
An Indigenous Peoples History of The United States by Roxanne Dunbar-Ortiz https://www.lcps.org/cms/lib/VA01000195/Centricity/Domain/10601/An%20Indigenous%20Peoples%20History%20of%20the%20United%20States%20Ortiz.pdf
Blood in my Eye by George Jackson https://redyouthnwa.files.wordpress.com/2018/05/george_l-_jackson_blood_in_my_eyebook4you-org.pdf
Black on Both Sides a Racial History of Trans Identity by C. Riley Snorton https://transreads.org/wp-content/uploads/2019/03/2019-03-17_5c8e04a08bf86_c-riley-snorton-black-on-both-sides-a-racial-history-of-trans-identity.pdf
Socialism: Utopian and Scientific by Fredrick Engles https://www.marxists.org/archive/marx/works/download/Engels_Socialism_Utopian_and_Scientific.pdf
Freedom is a Constant Struggle by Angela Y. Davis https://www.docdroid.net/rfDRFWv/freedom-is-a-constant-struggle-pdf
The Black Jacobins by CLR James http://ouleft.org/wp-content/uploads/CLR_James_The_Black_Jacobins.pdf
Quotations from Chairman Mao Tse-tung (The Little Red Book) https://www.marxists.org/ebooks/mao/Quotations_from_Chairman_Mao_Tse-tung.pdf
Black Anarchism: A Reader https://www.blackrosefed.org/wp-content/uploads/2016/02/Black-Anarchism-A-Reader-4.pdf
Revolution in the Air: Sixties Radicals Turn to Lenin, Mao and Che by Max Elbaum
https://thecharnelhouse.org/wp-content/uploads/2018/11/Max-Elbaum-Revolution-in-the-Air-Sixties-Radicals-Turn-to-Lenin-Mao-and-Che.pdf
https://thecharnelhouse.org/wp-content/uploads/2018/11/Max-Elbaum-Revolution-in-the-Air-Sixties-Radicals-Turn-to-Lenin-Mao-and-Che.pdf
Claim No Easy Victories, The Legacy of Amilcar Cabral https://libcom.org/files/Firoze-Manji_-Bill-Fletcher-Jr-Claim-No-Easy-Victories_-The-Legacy-of-Amilcar-Cabral-CODESRIA-Consei.pdf
The Communist Manifesto by Marx and Engels https://www.marxists.org/archive/marx/works/download/pdf/Manifesto.pdf
This Bridge Called My Back Writings by Radical Women of Color https://monoskop.org/images/e/e2/Moraga_Cherrie_Anzaldual_Gloria_eds_This_Bridge_Called_My_Back_Writings_by_Radical_Women_of_Color-Kitchen_Table_Women_of_Color_Press.pdf
Black Marxism: The Making of the Black Radical Tradition by Cedric J. Robinson https://libcom.org/files/Black%20Marxism-Cedric%20J.%20Robinson.pdf
Black radical google PDF drive (even better than this list) amazing works in here including Malcom X, bell hooks, Audre Lorde, Angela Davis, Baldwin, Fanon https://drive.google.com/drive/u/0/mobile/folders/1TrqfLp8DrCzCni58SB4-CEVSBlg0Kzq6
I learned about most of these books from @itswalela. Happy I can create a resource for y’all.
https://twitter.com/themayamorena/status/1292138649014939648?s=21 https://twitter.com/themayamorena/status/1292138649014939648
https://twitter.com/perhapsiamnoone/status/1291998661220749313?s=21 https://twitter.com/perhapsiamnoone/status/1291998661220749313
https://twitter.com/mooninmypalm/status/1291954872774995969?s=21 https://twitter.com/mooninmypalm/status/1291954872774995969
Another google drive of revolutionary reading including Black Bolsheviks, Blackshirts & Reds, From a Native Daughter, Ho Chi Minh on Revolution, The Anarchist Cookbook, https://drive.google.com/drive/mobile/folders/1ErBQvI8nXIRdt0-cT6ZFmzokUSHIwWP7
https://twitter.com/slimyajirobe/status/1292132219411206145?s=21 https://twitter.com/slimyajirobe/status/1292132219411206145
https://twitter.com/jimmyspacev/status/1274211613273456640?s=21 https://twitter.com/jimmyspacev/status/1274211613273456640
Not free books but threads on Indigenous literature https://twitter.com/eatatyranno/status/1315708170946457600
Free PDF link to “Custer Died For Your Sins” by Vine Deloria Jr. https://twitter.com/eatatyranno/status/1347628759856402432