The city's largest employer in 2005 is Tyson Foods, with 3,700 employees.
Tyson Foods fell 50 cents, to $15.50 a share, in over-the-counter trading.
He started his career at Tyson Foods in 1959.
Those people who say somehow this was a favor to me from Tyson Foods?
Tyson Foods, the world's biggest meat processor, fell 7.7 percent, to $12.90 a share.
Officials at Tyson Foods said they had been notified that the company might soon be indicted.
"If one were just looking at the odds, they seem to somewhat favor Tyson Foods," she said.
The latest investigation could not come at a more difficult time for Tyson Foods.
Tyson Foods had holdings in Mexico even before the treaty was passed.
The local recently beat back a decertification attempt by Tyson Foods.