code: func (m *Manager) isDirectMember(globalID, username string) (ismember bool, err error) {
  	matches, err := m.collection.Find(bson.M{"globalid": globalID, "members": username}).Count()
  	ismember = (matches > 0)
  	return
  }
docs: //isDirectMember checks if a specific user is in the members list of an organization