Sports Minister Fikile Mbalula was evacuated from an election rally at Freedom Park in North West on Sunday when Amcu members turned violent, the SABC reported.
Mbalula was taken away in a bullet-proof vehicle when members of the Association of Mineworkers and Construction Union (Amcu) threw stones at cars.
Mbalula had been conducting a door-to-door campaign in the area.
Members of Amcu at Lonmin, Impala Platinum and Ango American Platinum have been on strike for the past three months, demanding a monthly salary of R12 500 for entry level workers. On Thursday Amcu rejected the latest offer from the platinum producers.
According to the report, Mbalula said afterwards that the African National Congress would not be intimated through lawlessness. - Sapa