Harry Truman actually said...

During the war, this long-standing tendency toward economic concentration was accelerated.

As a consequence, we now find that to a greater extent than ever before, whole industries are dominated by one or a few large organizations ...

Thus, in my State of the Union Message in January, 1947, I said:

The Committee's study showed that, despite half a century of antitrust law enforcement, one of the gravest threats to our welfare lay in the...