code: public java.util.List<PolicyGroup> getPolicyGroups() {
          if (policyGroups == null) {
              policyGroups = new com.amazonaws.internal.SdkInternalList<PolicyGroup>();
          }
          return policyGroups;
      }
docs: <p>
  A list of IAM groups that the policy is attached to.
  </p>
  
  @return A list of IAM groups that the policy is attached to.