The Democratic Alliance says the ANC has turned from a party of liberation into one that facilitates a criminal state.
DA MP Wilmot James made the remark at a rally against the Protection of State Information Bill in Port Elizabeth on Saturday.
He said the bill was "a horrific plan" that would rob South Africans of the freedom they had won.
The bill is currently with the ANC's national council of provinces, who have proposed changes - including exemption from legal liability for the disclosure of classified information that reveals 'criminal activity'.
Wilmot praised the efforts of "many organisations" and "the efforts of some clear-thinking and genuine democrats in the African National Congress," for the changes but said another surge in protests was needed.
