Parr was assigned to New York early in March, 1907, and at once began an active investigation of the conditions existing on the sugar docks.

This terminated in the discovery of a steel spring in one of the scales of the Havemeyer & Elder docks in Brooklyn, November 20, 1907, which enabled us to uncover what were probably the most colossal frauds ever perpetrated in the Customs Service.

From the beginning of his active work in the investigation of the sugar frauds in March, 1907, to March 4, 1909, Parr, from time to time, personally reported to Loeb, at the White House, the progress of his investigations, and Loeb in his turn kept me personally advised.

On one occasion there was an attempt made to shunt Parr off the investigation and substitute another agent of the Treasury, who was suspected of having some relations with the sugar companies under investigation; but Parr reported the facts to Loeb, I sent for Secretary Cortelyou, and Secretary Cortelyou promptly took charge of the matter himself, putting Parr back on the investigation.
During the investigation Parr was subjected to all sorts of harassments, including an attempt to bribe him by Spitzer, the dock superintendent of the Havemeyer & Elder Refinery, for which Spitzer was convicted and served a term in prison.

Brzezinski, a special agent, who was assisting Parr, was convicted of perjury and also served a term in prison, he having changed his testimony, in the trial of Spitzer for the attempted bribery of Parr, from that which he gave before the Grand Jury.