That is the title of a 1996 essay by Michael Martin on the Secular Web. Martin concludes:
The suppression of expressions not only has harmful results but is inconsistent with atheists’ criticism of religion’s suppression of speech. It also defeats what is in the atheistic organizations’ own best interests. I conclude therefore that atheistic organizations should not suppress expression of opinion in their ranks unless such expressions are defamatory, seditious, invasive of privacy, or incitive to violence.