Gag rule 
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6/6/2021
Why a Culture War Over Critical Race Theory? Consider the Pro-Slavery Congressional "Gag Rule"
by Frank Palmeri and Ted Wendelin
Like the Southern delegations who opposed discussion of slavery, opponents of Critical Race Theory believe that any discussion of persistent racial inequities in legal and other institutions is unacceptable because it is “divisive.”
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SOURCE: CNN
2-9-17
Silencing Elizabeth Warren: Gag rules have a long, dark history
by Manisha Sinha
When Sen. Mitch McConnell declared of Sen. Elizabeth Warren that "she was warned" and yet "she persisted," he sounded like a throwback to a time when conservatives sought to silence abolitionist women like the Grimke sisters, and before them the black woman abolitionist Maria Stewart, who dared to speak out against slavery.