"cleansing" the haram by the expulsion of the family of Baha' Allah, demolishing and razing their houses.

The tomb of Baha' Allah as such was, as we have noted, designated as the qibla of the Baha'i world and is regarded by Baha'is as the most holy spot on earth. In this respect, its importance as a focus for pilgrimage far outweighs in the minds of most Baha'is that of the Shiraz and Baghdad houses. The area around the tomb itself is termed, in an echo of the sacred enclosure at Mecca, the haram, and considerable emphasis was placed by Shoghi Effendi on the ritual "cleansing" of this region by the expulsion from it of renegade members of the family of Baha' Allah, termed "Covenant-Breakers" (naqidun). In later years, the very houses in which these individuals had lived were demolished and their sites razed. The haram area has been widely landscaped, the shrine now standing at the centre of a vast circle of gardens, with paths converging on it. The original mansion of Bahji, in which Baha' Allah lived for some 20 years, stands to the side of the shrine proper.

(Rituals in Babism and Baha'ism by Denis MacEoin, London: British Academic Press, 1994)

https://bahai-library.com/maceoin_rituals_babism_bahaism