Charges against Maria Butina, the Russian accused of being a secret foreign agent, name as one of her contacts “U.S. Person 2.” That person is George O’Neill Jr., a Rockefeller heir and conservative writer, interviews and public documents indicate.

Court papers describe Ms. Butina discussing with Americans the idea of holding “friendship dinners” to bring together Russians with politically active Americans. One of those Americans, prosecutors say, hosted such a dinner in February 2017 before that year’s National Prayer Breakfast.

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