MOSCOW—Organisers of this year’s Eurovision Song Contest have disqualified Belarus, ruling that its entry song—by a band whose lyrics have been deemed in the past to mock anti-government protests—is in breach of competition guidelines. Earlier this month the organisers rejected an entry by Belarus, which has been gripped by political crisis since August last year, as the submitted song mocked protests against President Alexander Lukashenko. The song, by the band Galasy ZMesta, sparked a backlash from opposition figures in Belarus, who have faced a violent crackdown during the protests. After the European Broadcasting Union (EBU) rejected the song, Belarus submitted another option, by the same band. But late on Friday the EBU also turned that down. It said in a statement that it had “carefully scrutinized the new entry to assess its eligibility to compete” but found it to be “in breach rules of the competition that ensure the Contest …