Dog whistle racism
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dog whistle /n/: The use of terms that seem innocuous but are intended to convey a hidden and potentially controversial message to a particular audience.
—American Heritage Dictionary
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Trainers may use the whistle simply to gather a dog's attention, or to inflict pain for the purpose of behavior modification.
—Wikipedia
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A taxonomy of modern-day dog whistles
Focus on the strategic racism used to keep us apart
The race card: campaign strategy, implicit messages, and the norm of equality
Stop calling racist rhetoric a ‘dog whistle’
The racist roots of the dog whistle
The evolution of racist dog whistles
Thank Reagan and Clinton for Trump's dog whistle ways
Race-baiting for the presidency
Bush made Willie Horton an issue in 1988, and the racial scars are still fresh
How to defeat dog whistle politics: Report