According to the author, the way to stop intermarriage of Jews with goyim is, in a few words, by "the instilling of Jewish consciousness" in young Jews. Imagine that. Sounds like what the National Alliance does with it's people -- Aryan people, with a new Aryan consciousness.

So, I submitted a review of How to Stop an Intermarriage.
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3.0 out of 5 stars Practical Primer, June 27, 2016
By W. W. WILLIAMS
This review is from: How to stop an intermarriage: A practical guide for parents (Hardcover)
This Jewish author gives many reasons why members of his Tribe should not intermarry, or "race-mix" with goyim. Chapter 9, "What Should I Say If He Calls Me A Racist?" would be good advice to a White person who is called a racist. But, be warned: should the accused White person utter the Jew's recommended responses when called a racist for opposing intermarriage, he would then be called "Nazi scum." Every racially conscious goy should be familiar with Packouz's advice to his kinsmen against race-mixing. Such sweet reasonableness.