The Fosters used their house as a shelter on the Underground Railroad, and famously refused to pay taxes on the property because Abby was unable to vote.

Liberty Farm is a 2+1⁄2-story Federal style brick house, built around 1810, and now stands in a suburban area of western Worcester, Massachusetts.

In 1840 she was elected to the executive committee of the American Anti-Slavery Society, over the objections of conservative members who disapproved of women in leadership roles.

They sheltered escaping slaves as a station on the Underground Railroad, and refused to pay taxes on the property because Abby could not vote.

This latter form of civil disobedience resulted in the property's sale at tax auctions on several occasions; however, it was purchased by their supporters and given back to them.