This time he was sentenced to seven years in prison and two years and four months of forced relocation. A documentary about his time in Greece, entitled "Καπετάν Κεμάλ, ο σύντροφος" ("Captain Kemal, A Comrade"; Turkish title "Kaptan Kemal, Bir Yoldaş") was made by the prominent Greek filmmaker Fotos Lamprinos. Turkish revolutionary movement During the 1960s, Belli could write and speak without having to use an alias. Nevertheless, also in that period he served prison time for various articles and speeches. He was part of the group who published the revolutionary magazines Türk Solu and Aydınlık Sosyalist Dergi. Expelled from the TKP, he joined the newly formed Workers Party of Turkey (TİP). At this time, he developed his well-known thesis known as Milli Demokratik Devrim (National Democratic Revolution), abbreviated MDD. In 1964 Mihri Belli joined weekly Yön magazine. With his friends, Belli contacted Deniz Gezmiş and Mahir Çayan, who were at the time leaders of the youth movement amassing popular support. The ideas of MDD quickly gained prominence among the leftist youth movement; it became the main theoretical framework for most of the leftist groups that flourished in Turkey in that period and played a key role in the '68 movement in Turkey, giving it a Marxist and revolutionary characteristic. Mihri Belli left Turkey after the 1971 military coup to avoid arrest, and was for a while a guest of the Palestinian Liberation Organization. He returned to Turkey briefly, en route to Western Europe. There he stayed for a while and helped with the magazine Yurtsever (Patriot). He returned to Turkey when the centre-left Republican People's Party (CHP) under Bülent Ecevit emerged as the largest party in the 1973 elections. After the amnesty of 1974, he founded the Labour Party of Turkey (TEP) in 1975. Immediately after the founding of the party, the prosecutor's office of the Martial Law Court took notice and demanded the removal of the word Kurd from the party program and other documents. The Constitutional Court banned the TEP for demanding equal rights for Kurds. In 1979, Belli faced an assassination attempt in which he was severely injured. After the 1980 military coup, he left for the Middle East. From there he moved to Sweden, where he followed the Kurdish movement closely until he returned to Turkey in 1992. In 1997 he met with Abdullah Öcalan, and they came to the common conclusion that a solution