Background
Miguel Castells was a lawyer and member of Spain's senate. In 1979 he wrote an article claiming that the Spanish authorities had not properly investigated a series of murders, allegedly carried out by extremist right-wing groups. According to Miguel, the extremist groups were guaranteed immunity from prosecution, before their crimes were carried out.
Miguel was prosecuted for insulting the government. Several times during the prosecution, he offered to prove his accusations. However, the courts in Spain ruled that Miguel was not allowed to give such evidence, because under Spanish law a person could be found guilty of insulting the nation’s institutions even if his accusations were true.
Miguel was convicted and sentenced to one year in prison, as well as a temporary ban on holding public office or carrying out a profession.