Robert Mugabe’s supporters have been conducting a sustained and aggressive campaign of intimidation against up to 1.5m rural farm workers and their relatives to force them into voting for him in a prospective election run-off, according to an authoritative report published on Wednesday.

The report by Zimbabwe’s Justice for Agriculture Trust (JAG) catalogues a “co-ordinated and centrally planned push” to remove the country’s few remaining white farmers “and bully their workers” as “a backlash” against the defeat of the ruling Zanu-PF and the president in elections in March.