"For starters, Dollinger suggested that "religiously traditional" Jewish people were less engaged in social justice movements."

Great article! My late husband was Jewish, and I have at least some perspective and thoughts on the history of Jewish people and social justice in the U.S.

As a small bit of add-on, I'd like to note that the opposite of "religiously traditional" in Dollinger's observation is not "secular." Religiously traditional, or Orthodox, Jews are in a small minority of all U.S. Jews. Members of Reform and Conservative congregations are in a solid majority. These two movements incorporate social justice strongly into their central ethos – as religious obligations.

That's not to say all members of such congregations act on social justice teachings, of course, but they're more likely to than a random American or a member of "religiously traditional" Jewish congregations, which tend somewhat more toward the insular or inward-looking.

Caveat: Many Orthodox Jews would insist that they also are religiously obligated to work for social justice. Nothing in my comment is meant to deny that.