A Brief Introduction To Dialectical Materialism -  Dialego - 1975
Channel: ObscureAudioHistory
Date: 25/08/2021

Source can be found here. 
https://roadtoliberation.org/wp-content/uploads/2017/11/Brief-Intro-to-Dialectical-Materialism.pdf

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"Excerpts from Dialego’s Philosophy & the Class Struggle (1975), a communist pamphlet used widely in the South
African anti-apartheid struggle in the 1970’s."