"The overwhelming majority of crack cocaine offenders convicted of an offense carrying a mandatory minimum were male (92.7%, n=3,620)658 and were United States citizens (97.2%, n=3,796).659 More than three-quarters (78.6%, n=3,728) of all crack cocaine offenders were Black. Black offenders constituted a similar proportion (78.5%, n=3,059) of those crack cocaine offenders convicted of an offense carrying a mandatory minimum penalty. The proportion of Black crack cocaine offenders subject to a mandatory minimum penalty at the time of sentencing (78.7%, n=1,961) was comparable to their proportion in the overall crack cocaine offender population and the population of crack cocaine offenders convicted of an offense carrying a mandatory minimum penalty."

Source

"Report to Congress: Mandatory Minimum Penalties in the Federal Criminal Justice System" (Washington, DC: US Sentencing Commission, October 2011), p. 191.
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