I wish my countrymen to consider, that whatever the human law may be, neither an individual nor a nation can ever commit the least act of injustice against the obscurest individual, without having to pay the penalty for it. A government which deliberately enacts injustice, and persists in it, will at length even become the laughing-stock of the world.

Henry David Thoreau (1817-1862) American philosopher and writer
Speech (1854-07-04), “Slavery in Massachusetts,” Anti-Slavery Celebration, Framingham, Massachusetts
    (Source)

After the conviction in Boston of Anthony Burns, under the Fugitive Slave Act of 1850. This led to large protests and an abolitionist riot at the Boston Courthouse, requiring Federal troops and state militia to ensure Burns' transport to a ship sailing to Virginia.