Which preposition to use with anabaptists

in Occurrences 4%

By the public the sermons at Blackfriars were considered as explanatory of the views and principles of the Anabaptists in the house.

at Occurrences 1%

During the civil war he served as a soldier in the parliament army; and subsequently joined a society of Anabaptists at Bedford, and became their public teacher.

to Occurrences 1%

I was brought up in the Church of England, and have never joined any other religious society, but I have had close acquaintance with many Dissenters of various sects, from Calvinistic Anabaptists to Unitarians.

Which preposition to use with  anabaptists