(May 17, 1911 – September 8, 1996), known as Ernst T.
Krebs, was a notorious American "conman" (abbr.
confidence-man) who promoted various substances as alternative cures for cancer, including pangamic acid and amygdalin.
He also co-patented the semi-synthetic chemical compound closely related to amygdalin named laetrile, which was also promoted as a cancer preventative and cure.
His medical claims about these compounds are not supported by scientific evidence and are widely considered quackery.