TheCodeBreakers
of Censorship at Pennsylvania and Constitution avenues
in Washington. Shaw administered it from Room 509
with three assistants and a secretarial staff. Two technical
sections operated under maximum security in a windowless,
| guarded area on the seventh, or top, floor. The laboratory
was headed by Dr. Elwood C. Pierce, a biochemist at the
University of Indiana who had joined Censorship at the
start of the war. He and his assistant, Dr. Willard Breon
of the University of Maryland chemistry faculty, had prepared a
manual on detection of secret inks, trained key personnel of the
censorship field stations in laboratory operation, and handled some of
the more active and difficult cases themselves. From Hawaii Shaw
imported his trusted cryptanalytic expert to form a unit "capable," he
said, "not only of cracking codes and ciphers but also of building the
intricate dossiers of personal history, contacts, handwriting peculiarities,
annaabi.ee 
