Garcia Pereira is the nephew of Colonel Francisco Vasconcellos Pestana, one of the organizers of the Assault on the Beja Barracks, an attempt to overthrow the Portuguese dictatorship Estado Novo that occurred from 31 December 1961 to 1 January 1962.
He began teaching at the University of Lisbon in 1975 and has been working as a lawyer since 1977, the year he was admitted to the Portuguese Bar Association, which awarded him the title of specialist in Labour Law.
He joined the Marxist–Leninist Students' Federation, the youth wing of the MRPP, in 1972, the year he witnessed the assassination of José Ribeiro dos Santos[5] by PIDE.
He was involved in the associative movement 'Dare to Fight, Dare to Win,' and faced suspension and disciplinary proceedings at the Faculty of Law of the University of Lisbon in December 1973.
A member of the PCTP/MRPP since 1974, a political group with a significant presence in Lisbon's university milieu, Garcia Pereira rose to leadership within the Central Committee of this organization in 1982.
On 25 November 2015, Garcia Pereira resigned from the PCTP/MRPP, citing 'constant personal attacks and defamatory accusations of all kinds, without any opportunity for debate,' published against him in the party's online newspaper.
[6] On 24 May 2017, Garcia Pereira ended his silence since 6 October 2015 by launching a website[7] containing eight texts aimed at exposing the truth behind the falsehoods published in the PCTP/MRPP newspaper over the previous 18 months.
The introductory text explained his reasons for breaking his silence: the obligation to reveal the truth, respect for his party comrades and friends, and for the 60,000 PCTP/MRPP voters.