Investigators were puzzled, but their focus soon shifted to Mario Buda, a longtime activist and former associate of Sacco and Vanzetti. The stock market ascended, the sun shined and elaborate business lunches beckoned. Wall Street had to show that it was functioning.As the financiers regained their footing, the NYPD, the FBI and private detective firms such as Pinkerton and the William J. Burns International Detective Agency began investigations. At 11:45 on the morning of September 16, 1920, it was a glorious time to be on Wall Street. Financial District workers barely recalled a thing.
The investigation led to an astounding conclusion.
( z0 lead :ARG0 ( z1 investigate ) :ARG2 ( z2 conclude :ARG0-of ( z3 astound ) ) )
(z0 / lead-03
    :ARG0 (z1 / investigate-01)
    :ARG2 (z2 / conclude-01
              :ARG0-of (z3 / astound-01)))
The investigation led to an astounding conclusion .
z0 :ARG0 z1
z2 :ARG0-of z3
z0 :ARG2 z2