The Commission heard evidence from Sir Matthew Nathan, Augustine Birrell, Lord Wimborne, Sir Neville Chamberlain (Inspector-General of the Royal Irish Constabulary), General Lovick Friend, Major Ivor Price of Military Intelligence and others.
A Comisión escoitou as probas de sir Matthew Nathan, Augustine Birrell, lord Wimborne, sir Neville Chamberlain (inspector xeral da Policía Real Irlandesa), o xeneral Lovick Friend, o Maior Ivor Price da Intelixencia Militar, entre outros.