James L. Roark, et al., eds., The American Promise: A History of the United States, 2nd ed., vol. 1 (Boston: Bedford/St. Martin’s, 2002), 457.
Others actively resisted [the Fugitive Slave Act]. Theodore Parker, the clergyman and abolitionist, denounced the law as "a hateful statute of kidnappers" and headed a Boston vigilance committee that openly violated it. In February 1851, an angry crowd in Boston overpowered federal marshals and snatched away a runaway named Shadrach from a courtroom, put him on the Underground Railroad, and whisked him away off to Montréal Canada.