[5] In August 2013, Miranda was carrying a thumb drive with classified material provided by Edward Snowden when he was detained by the British government at London's Heathrow Airport under Schedule 7 of the Terrorism Act 2000 on a layover between Berlin and Rio de Janeiro.

[17] On 11 September 2019, O Globo newspaper reported[18] that an investigation by a division of the Brazilian Ministry of the Economy identified R$2.5 million in suspicious transactions in Miranda's personal bank account during a one year period from 2018 to 2019, including deposits from current and former employees.

According to media reports, investigators suspected Miranda of "concealing the origin" of the funds and participating in an illegal practice known as "rachadinha [pt]", in which public servants employed in the offices of elected officials kick back a portion of their salary to their boss.

[20] 2018 center-left presidential candidate Ciro Gomes and center-right pundit Reinaldo Azevedo both described the investigation against Miranda as borne out of a spirit of police state and political persecution.

[21][22] A few days afterwards, Miranda and Greenwald opened their bank accounts for public access, and challenged the Bolsonaro family to follow suit.

[23] On 22 January 2022, Miranda announced that he was leaving the PSOL and joining the Democratic Labour Party (PDT) and endorsing its leader Ciro Gomes in the 2022 Brazilian general election.

[5][17] Soon after they first met, Greenwald encouraged Miranda's return to education and he graduated from Escola Superior de Propaganda e Marketing (ESPM) in 2014.

[25] Various Brazilian politicians, including President Luiz Inácio Lula da Silva, expressed sorrow over his death.