The Sisters of Mercy required and received much support from many. Each congregation of the Sisters of Mercy needed to affirm in writing to the Congregation for Institutes of Consecrated Life their desire to enter the Institute of the Sisters of Mercy of the Americas.

Title: Letter from the Sisters of Mercy, Brooklyn Community / Date: 1988-09-30 / Creator: Lois J. Keller, RSM / Description: This letter was sent from the Superior General of the Sisters of Mercy, Brooklyn Community to the Cardinal Jean Jerome Hamer of the office of Congregation for Institutes of Consecrated Life. / Source: Federation Collection / Additional Information: (c) Mercy Heritage Center, Institute of the Sisters of Mercy of the Americas