Police in the UK have confirmed they are investigating a performance by punk duo Bob Vylan at the Glastonbury Festival, after the group's singer led chants of "Death to the IDF [Israel Defence Forces]" during their set on Saturday, 28 June. Several UK-based politicians and commentators have condemned the remarks, with some claiming they amount to antisemitism. What chance is there of the case progressing to prosecution or trial? To try to understand that we asked legal experts where UK law draws the line on protest, free speech, hate crime, and public order. What are the police investigating? On Monday...