Demonstrators shouted slogans such as "Freedom for Pablo Hasel" and "We are the anti-fascists", as they took to the streets in the Spanish capital.
Rapper Pablo Hasel's case has put the spotlight on freedom of expression in Spain, prompting the government to announce it would relax free speech laws.
The nine-month sentence of Pablo Hasel, known for his virulently anti-establishment raps, has prompted debate over freedom of expression in Spain and sparked protests that have at times turned violent.
Police and demonstrators in Barcelona have clashed for a fifth night with thousands hitting the streets across Spain in protest against the jailing of a controversial rapper.
Pablo Hasel is in detention over a series of tweets in which he accused former king Juan Carlos I of being a mafia boss and said Spanish police tortured and killed demonstrators and migrants.
Rapper Hasel was convicted for glorifying terrorism, slander and libel against the crown and state institutions over tweets that called former King Juan Carlos I a mafia boss and accused police of torturing and killing demonstrators and migrants.
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