A series of articles on clandestine organizing written by the South African Communist Party while it was underground during the anti-apartheid struggle.
Source: No Name Distro
Letter booklet, part one, to print: How to Master Secret Work_part one
Letter booklet, part two, to print: How to Master Secret Work_part two
(note: each part is just seven pages, but needs to be added together manually since the file was to big to upload in one piece)