Will is likely the group’s vice-chair, Will Ramsay, and Angus is believed to be businessman and prominent supporter Angus Mac Donald.
The Prestonfield dinner was a £250-a-head meal held in a five-star hotel in the capital in 2016.
Yisroel Schulman, former president and attorney-in-charge for New York Legal Assistance Group (NYLAG) reached an agreement with the office of New York Attorney General Eric Schneiderman this week over allegations of breached fiduciary duties.
Schulman, as part of the settlement, has admitted to numerous breaches of fiduciary duties and has agreed to pay $150,000 to NYLAG, an organization that provides civil legal services for those unable to pay a private attorney.
Scotland In Union says it has reported the leak to police and information watchdogs, but it faces a possible investigation which could lead to sanctions and a huge fine.