The Sinn Féin president, Mr Gerry Adams, made nearly $40,000 (€30,737) for his party from two US speaking engagements last March, accounts obtained from the US Treasury Department have shown.
The money is part of nearly $600,000 earned by the party in the six months before May.
Mr Adams picked up $18,750 from a professional speaker's firm, the Washington Speakers Bureau, which hired him to speak at Quinnipiac University in Connecticut on March 15th. The next day Mr Adams made $20,000 from an engagement at Notre Dame University in Indiana.
The speech was co-sponsored by the Keough Institute for Irish Studies, named after former Coca-Cola chief Donald Keough.
Mr Keough led the organising committee of a 2001 Atlanta fund-raiser for the party that netted over $100,000 for Sinn Féin. He also contributed $5,000 at the same event, while Coca-Cola gave $5,000.
The speaking circuit has proved lucrative for the party. Last year, Mid-Ulster MP Mr Martin McGuinness earned $10,000 for the party from a speech at the College of St Rose in Albany.
The latest figures, given to the Treasury Department by the US fund-raising group, Friends of Sinn Féin, to comply with the foreign agents registration act, show the party also received tens of thousands of dollars from US unions. Donations included $5,000 each from the International Association of Heat and Frost Insulators and Asbestos Workers, the Southern California District Council of Labourers and the Labourers International Union of North America.
The accounts show Friends of Sinn Féin sent $359,867.93 to the party in Ireland, $111,313.41 of which was spent on printing costs, $112,003 on construction, $55,576 on research and $24,962 on advertising.