Hopes for a more progressive Chile have been dealt a blow as a far-right candidate surges in opinion polls ahead of the first presidential election since massive demonstrations against inequality erupted in 2019. A month before the vote, polling shows that the leftwing candidate – former student leader Gabriel Boric – has slipped behind (by one percentage point) José Antonio Kast, a supporter of the dictator Augusto Pinochet, who has suggested digging ditches along the country’s border to stop migrants. After months of political unrest, voters chose by huge majority to replace the country’s Pinochet-era constitution, and then elected a...