For the record, in the year before I left the cult (2004) the only "charitable" works the religion cited to secure its charitable organization status from the United States government was "Education."
They do not offer education as a charitable work, rather, they offer propaganda.
Unless that has changed, they would not be among the charities Kramer referenced. It is a common fallacy for people to assume that JWs are charitable in much the same way as other religions, but JW literature actually scorns other religions for creating "rice Christians" out of the people they are charitable toward.
It isn't easy, at all, to reconcile life as a JW with chapters four and five of Acts, or with any of the many times Jesus urged charity with material goods.