[2] As head of the State Criminal Law Department, Bal prosecuted FC Barcelona player Lionel Messi and club president Josep Bartomeu for tax avoidance.

[4] He also successfully prosecuted Cristiano Ronaldo, Ángel Di María, Radamel Falcao, Luka Modrić and José Mourinho for the same crime.

He was dismissed in November 2018 after a change of government, with the new Spanish Socialist Workers' Party (PSOE) administration not believing that it was an insurrection.

[8] He initially lost his seat following the November elections, but regained it after party leader Albert Rivera retired from politics.

[9] In March 2021, Bal received 89.4% of votes in the primary to lead Citizens in the Madrid regional elections in May.