Tillman was an advocate of reparations for slavery and was successful in having a number of resolutions passed in support of the concept. She authored a bill, passed unanimously in 2002, forcing companies who perform contracts with the council to declare any past ties with slavery. In early 2005, Tillman led a campaign against a $500 million refinancing deal with the Bank of America because of its alleged links with slavery. In the case of the Bank of America, these links are allegedly through FleetBoston Financial, a company which it acquired in 2004. Providene, a predecessor of Fleet Boston, was supposedly founded by a slave owner in 1791.