Christian Science did not allow members to be members of any other societies accept Freemasonry

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In its earlier years the Church of Christ Scientists did not allow members to be members of any other organization, except Freemasonry. 

American Christian Science Architecture and its Influence

Mary Baker Eddy Library 

June 16, 2011

https://www.marybakereddylibrary.org/research/american-christian-science-architecture-and-its-influence/

See Eddy 1896, pp. 142-143; Eddy 1913, 351. A Church Manual by-law (43rd edition, Article XXVI) requiring members to be free from other organizations at first excepted Free Masons.