Vietnam that was founded on 3 February 1930. Since most of the prison officers belonged to the Ê Đê people who did not speak any Vietnamese, Phan Đăng Lưu began to learn the Ê Đê language. He would then bring out a weekly prison newspaper "Doãn đê tù báo" in Ê Đê and Vietnamese, handwritten and secretly distributed, to foster good relations with the prison officers and to teach other inmates the Ê Đê language. Moreover, he wrote articles in French and Vietnamese, thereby also drawing attention to the severe prison conditions and had them smuggled to the outside whenever inmates would be released. When he was caught, his prison sentence was increased by additional 5 years. Upon his release from prison in February, 1936, prior to the end of his full sentence due to a democratic and human rights movement in Indochina and France that had formed for the release of political prisoners, Phan Đăng Lưu was admitted into the Communist Party's Committee of Middle Vietnam (Xứ ủy Trung Kỳ). Together with , Hải Triều, Lâm Mộng Quang, Trịnh Xuân An, Hải Thanh and others he was tasked with taking the Party's political activities into the legal and open sphere of influence. Therefore, Phan Đăng Lưu edited and published many articles in newspapers such as Sông Hương tục bản, Dân, Dân Tiến, Dân Muốn under various pen names such as Đông Tùng, Phi Bằng, Bằng Phi, Sông Hương, Tân Cương, Ly Toét, BCH, QB, SH, KD, Mục tiêu, Thương tâm, KĐ, etc. During this time, Phan Đăng Lưu had a major influence on other revolutionaries in Nghệ Tĩnh and Huế such as Trịnh Xuân An, , Trịnh Quang Xuân, Hà Thế Hanh and also on the younger generation of revolutionaries such as Tố Hữu, Trần Tống, , Nguyễn Chí Thanh, Võ Nguyên Giáp. In the years between 1937 and 1939, Phan Đăng Lưu published influential works and books such as The Capitalist Society ("Xã hội Tư bản"), The Old and New World ("Thế giới cũ và Thế giới mới"), etc.. Since Phan Đăng Lưu was also close to Phan Bội Châu, he would help him to finish his work Phan Bội Châu Chronology ("Phan Bội Châu niên biểu"). In September 1939, Phan Đăng Lưu was assigned to move into South Vietnam continuing to lead the party's underground revolutionary activities. In November 1939, at the VI general plenum of the