[11][12] In Boston "by 1830 the population had increased so much that it was felt that the time had come when more room was needed, and soon afterwards the first grand real estate enterprise was inaugurated by the filling up of the South Cove.
"[13] As an abolitionist, Jackson assisted fugitive slaves: "he sheltered many in a room of his house, at Number 31 Hollis Street.
[18] In his will, Jackson left considerable funds to abolitionist and women's suffragist efforts, and wrote about Massachusetts: Disregarding the self-evident declaration of 1776, repeated in her own constitution of 1780, that 'all men are born free and equal,' Massachusetts has since, in the face of those solemn declarations, deliberately entered into a conspiracy with other states, to aid in enslaving millions of innocent persons.
I have long labored to help my native state out of her deep iniquity, and her barefaced hypocrisy in the matter; I now enter my last protest against her inconsistency, her injustice, and her cruelty, toward an unoffending people.
[19]Jackson also left money to fellow abolitionists and activists Charles C. Burleigh, Lydia Maria Child, Stephen S. Foster, Francis Jackson Garrison, William Lloyd Garrison (whose son, Francis Jackson Garrison, was named after him[20]), Oliver Johnson, Parker Pillsbury, Charles Lenox Remond, Lucy Stone, Robert F. Walcott and Charles K.
However, citing the cy-près doctrine, Justice Horace Gray denied the relatives' claim and converted the trust into an educational charity for former slaves, to better their living condition.