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In page Boston Female Anti-Slavery Society:

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In 1836 the Society joined with other groups in suing for habeas corpus in the "freedom suit" known as Commonwealth v. Aves. They sought freedom for the young slave girl Med, whose mistress had brought her to Boston from New Orleans on a trip. The court decided in favor of the slave's freedom and made Med a ward of the court. The decision caused an uproar in the South and added to tensions over slaveholders' travel to free states, as well as the hardening of positions in the years leading up to the Civil War. It was the first case in which a slave was determined to be free soon after being brought voluntarily to a free state.[citation needed] That same year, the Society was involved in the Abolition Riot of 1836.[2]