The Alternative Information Development Centre was removed from the National Council of Provinces ad hoc committee hearings for making "political statements" about the origins of the proposed law.
Mark Weinberg, presenting an oral submission for the group, was ordered to stop as MPs felt he was failing to address the contents of the bill.
Papi Tau, chairman of the NCOP ad hoc committee that is processing the contentious bill, objected to the group linking the bill with political developments including the ANC's 2007 elective conference in Polokwane.
Weinberg said his ejection was "more evidence of the undemocratic culture gripping our government".
But Tau on Friday stuck to his guns, saying Weinberg was shown the door after he ignored several warnings to stop making political statements, including calling President Jacob Zuma a "securocrat" and departing from his written submission.
"He had departed entirely from that and he went way overboard in his oral presentation. It is absolutely incorrect for anybody to believe that having stopped him was intolerance by parliament," said Tau.
"We've heard people who differed with us totally; one example I can give is Right2Know, they have been all over with us during provincial public hearings, calling us all sorts of names and insulting us, but they were here on Thursday."
Weinberg said his submission sought to offer the "socioeconomic and political" context of the bill. He accused Tau's committee of failing to read his submission ahead of his presentation.
"It became clear that MPs had not read the AIDC submission and were surprised by its contents," he said.
The committee is due to start deliberations on the bill later this month.
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