Those who believe after Baha’u’llah, his younger son Mohammed Ali was his true successor.
Followers of `Abdu'l-Bahá's brother, Mirza Muhammad `Alí, who was named by Bahá'u'lláh to be the leader of the Bahá'ís after `Abdu'l-Bahá's passing, but was excommunicated by `Abdu'l-Bahá. There is little evidence that this is an organized group. All these sites are posted on the same web hosting service, and most of their material appears to come from a book of the orientalist E.G. Browne.
Websites: http://www.unitarianbahai.com/
Abdu'l-Bahá: The Most Mighty Branch
http://ninetin.tripod.com/abah/abdulbaha.htm
http://unitarianbahai.angelfire.com/
http://www.unitarianbahai.org/
http://groups.yahoo.com/group/unitarian-bahai/
Abdu'l-Bahá, Baha'i Faith & E.D. Browne
Presents E.G. Browne's account of the degradation of `Abdu'l-Bahá as leader of the Bahá'ís.
http://members.tripod.com/%7Eninetin/BB2/index.htm
The Secret Activities of Abdu'l-Bahá
Presents E.G. Browne's account of the degradation of `Abdu'l-Bahá as leader of the Bahá'ís. Extracts from E.G. Browne's Materials For the Study of the Babi Religion.
http://members.tripod.com/ninetin/abdulbaha/