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Can we capture present members of a group and removed members from a group
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Yes we have a function and smart service for that.
Fetching Group Members - https://docs.appian.com/suite/help/22.2/fnc_people_a_groupmembers.html
Remove Group Members Smart Service - https://docs.appian.com/suite/help/22.1/Remove_Group_Members_Smart_Service.html#:~:text=The%20Remove%20Group%20Members%20node,Group%20or%20System%20Administrator%20rights.
For fetch the group Member you can use the function which Ujjwal mentioned and to remove we have function as well as Smart service available.
Remove Group Members Smart Service - Appian 22.3