They made contact with Baha'u'llah in Baghdad during the mid-1850s and met with him personally. Only a few short years afterwards Baha'u'llah openly made his claim and relegated Subh-i-Azal to the margins and had all the prominent dissenters murdered. Subh-i-Azal was not willing to play any games with Masons and British agents such as Manekji and Malkom Khan, so the British rite Masons split up Babism and supported Mirza Husayn Ali Nuri Baha'u'llah to make up his own religion which they have supported ever since. The association of Manekji and Malkom Khan with Baha'u'llah is openly admitted by Baha'i sources.

http://bahaism.blogspot.com/