This piece in ProPublica on Machine Bias.
https://www.propublica.org/article/machine-bias-risk-assessments-in-criminal-sentencing
Their charts show how software that was supposed to predict criminal behavior turned out to be biased toward African Americans. They showed this by comparing African American risk assessment scores with those of whites. White defendants were skewed toward lower-risk categories. Black defendants were not. The charts provided visual context for the story's main point.