Fine that the Francoist dictatorship authorities made the director of Sant Jordi choir pay for having sung an unauthorized Catalan song on April 23rd 1964. This fine is kept as a historical document in the archive of the University of Barcelona.
General Francisco Franco's fascist dictatorship of Spain (1939-1975) banned and persecuted the use of the Catalan language for many years, allowing it towards the end of the dictatorship only in certain settings and under strict supervision of the police and censorship authorities. The dictatorship had the objective of eliminating the Catalan language, culture, and identity, and making all Catalan people become Spanish people. Cultural elements of Catalan culture were forbidden, such as certain songs, dances, and celebrations of traditional holidays, and people were imprisoned, tortured, and even sentenced to death for defending the right to exist of the Catalan people. The same persecution was suffered by the other nationalities under Spanish rule (mostly Basques and Galicians).
The choir Coral Sant Jordi, named after Catalonia's patron saint (Saint George), was founded in 1947 by Oriol Martorell. Its objective was to sing choir music with a focus on traditional Catalan music. The choir toured around Catalonia singing these songs with a great vocal quality, and became a symbol of cultural resistance against the dictatorship's attempt of ethnocide.
In the 1960s, the dictatorship wanted to become a normalized part of Europe and the international community. The regime opened Spain's borders to survive as a fascist stronghold, and thanks to the help from the USA (who was promoting fascist governments around the world), fascist Spain was accepted in the UN, normalized its relations with many countries, and opened its borders to tourism. To look more acceptable, it did some reforms among which they allowed speaking the local languages (Catalan, Aranese Occitan, Basque, Galician, etc) in public in some acts, as long as the person who was going to do it applied for official permission and turned in everything they were going to say or, in the case of a concert, the track list of all the songs that they were going to sing and all their lyrics as well as if they were going to speak between songs. The censorship authorities could accept or deny this application, and very often they censored parts of what was going to be said or sung, or whole songs.
On April 23rd 1964, the choir Sant Jordi sang in a fundraising event to raise money for a church. Like all Catholic churches, this church is under the title of a saint, virgin, or similar. In this case, the church is dedicated to Saint George, who their choir is also named after. In the concert, the choir sang an extra song that wasn't on the tracklist that they had submitted to be approved by the censorship authorities. This extra song was the "Goigs de Sant Jordi" (goigs are a traditional Catalan music genre of songs dedicated to exalting a particular saint or Virgin). This is a goigs song composed in the year 1885 in the Catalan language, which explains the saint's story and asks: "patron of knighthood, watch over my homeland and for its rebirth".
For having sung this, the Spanish government made Oriol Martorell (conductor of the choir) pay a fine of 10,000 pesetas, a huge amount at the time. Oriol appealed the resolution many times, even reaching the Supreme Court, but as was expected they did not repeal it, and he (with support from the rest of the choir) had to pay the fine.
Under the cut I've included the whole lyrics of the unauthorized song translated to English.