MADRID — Venezuela and Cuba this week released political prisoners, including a free speech advocate, but analysts say the threat of legal action in authoritarian countries stifles media freedom. In Venezuela on Thursday, Carlos Correa, director of the free speech organization Espacio Publico, was freed after a week in custody, his group reported. Authorities had arrested Correa along with at least six others, including opposition politicians, ahead of President Nicolas Maduro’s inauguration last Friday. “We thank all the people, organizations, governments and groups that joined the voice for [Correa’s] liberation. We continue to defend human dignity,” Espacio Publico said in