Blog post about using PUMA SPI It shows how to get the groups to which a user belongs.
PumaProfile
This contains methods that provide read-only access the User and Group attributes and identifiers. You can use this interface to get the User object for the current user.
PumaLocator
This contains methods for looking up User and Group objects. You can use this interface to obtain a List of Group objects for all of the groups in which the current user is a member.
PumaController
This contains methods for creating and deleting Users and Groups and for modifying the User and Group profiles and membership.