In Portugal , prior to April 1974, political graffiti rapidly scribbled subversive political sayings waged against the fascist regime had been employed to express opposition to the “New State”.
Developments after saw “elaborated mural paintings were already being made, inspired by other revolutionary muralist traditions such as the Mexican and the Chinese ones. The new atmosphere of political freedom and social experimentation paved the way for revolutionary political messages to be inscribed in visible and accessible public spaces.” [André Carmo]
Mural na Sede Nacional do PCTP-MRPP, Avenida Álvares Cabral.
The explosion of popular street art and wall murals as a communication form was not restricted to the MRPP, by far the largest number of murals were carried out by the rival militants of the Portuguese Communist Party (PCP) throughout the country. The mural paintings made by the PCTP/MRPP in aftermath of the 1974 Portuguese revolution were subject to academic study of the MRPP aesthetics in André Carmo’s article Revolutionary landscapes: the PCTP/MRPP mural paintings in the Lisbon Metropolitan Area [Finisterra, XLVI, 92, 2011, pp. 25‑2451]
These murals served as elaborate propaganda for the Maoist-inspired Proletariat Party Reorganization Movement (founded September 1970), legalized as a party on February 18, 1975, following the ending of the Salazar military dictatorship. On December 26, 1976, following the First National Congress, it was renamed the Communist Party of Portuguese Workers, with the acronym PCTP / MRPP.
The production of mural paintings were deliberate acts of political intervention 
“ in a specific moment of the national life, current politics were discussed at the Central Committee level and then went all the way down until reaching the graphic committee (…) after defining the political guidelines to apply in the paintings they were discussed in the graphics committee and the propaganda department.”
1975 Guide for Agitation and propaganda
The subject matter for this political wall art were calls for support in national legislative elections i.e. “In the Assembly the voice of labor against capital!” (1)and the MRPP mural in Portalegre representing Alentejo agricultural workers, and calling for vote in legislative elections in April 1976.(2)
(1) 
(2) 
There was support for General Ramalho Eanes’ campaign for the presidential elections in June 1976 made on the walls of the Instituto Superior Técnico: Technical University of Lisbon, (3) and Eanes’ second candidacy for presidential elections in 1981. (4) The location reflective of PCTP/MRPP base of support in the politically active youth enrolled in universities and secondary education schools of Lisbon. Carmo notes this mural painting had to face great animosity from other radical leftist organizations, above all the UDP- People’s Democratic Union. Radical left party founded in 1974. Some of the people passing by requested to be depicted in the mural painting and, consequently, some of the human figures represented were real people who had to pose for the muralists; some of them stayed near the mural painting in order to help protecting it as well as the painters, from attacks.
(3)
(4)
Mural painting on Avenida Duarte Pacheco about General Ramalho Eanes’ second candidacy for presidential elections
(5)
(6) 
Beside the expected commemorative calls: the May 1st commemorative mural in Alcântara Mar, (5) and later (1995) PCTP-MRPP mural in Alcântara commemorating the 18th of September, the date of the founding of the party, (6) there were the general political positions and slogans associated with the party: most memorable (7) was ‘Only Workers Can Beat the Crisis!’ the PCTP-MRPP mural on Gomes da Costa Avenue, Cabo Ruivo, a working class neighbourhood on the outskirts of Lisbon, in September 1977. It depicted a series of popular demands in line with the political ideology underlying the PCTP/MRPP, and its location reflected the audience it want to reach with its political message.
(7)
(8) People’s Government, the MRPP mural at the Estação de Rossio, the primary station in Lisbon for the Lisboa-Sintra suburban railway.
And PCTP-MRPP mural at Instituto Superior Técnico against censorship.(9)
Photographs by Rosário Félix housed by the Mário Soares Foundation
Archive Source ~ The Common House portal
http://casacomum.org/cc/arquivos?set=e_7920/p_2#!e_692
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