Martin Sostre was a pioneer for prison reform and prisoner rights. His fight against the injustices he faced as a prisoner helped secure rights for all prisoners, and continue to be an inspiration for those resisting the prison-industrial complex. 

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Sources: 
https://www.instagram.com/p/C9asvdCS5HL/?igsh=MTc4MmM1YmI2Ng%3D%3D 
https://www.youtube.com/watch?v=m4Y0n1uvgLA&t=436s 
https://www.npr.org/sections/codeswitch/2017/04/14/507297469/how-one-inmate-changed-the-prison-system-from-the-inside
 https://www.martinsostre.com/ 
https://en.wikipedia.org/wiki/Martin_Sostre