Unassuming from the road, this farmstead served as the headquarters for a ring of international thieves bent on embezzling U.S. seed. The FBI thwarts a ring of Chinese national thieves. Crouched on his hands and knees under an Iowa sky, Mo Hailong quickly dug in the rows of freshly planted seed corn. Just the day before, May 2, 2011, he and coworker Wang Lei, vice chairman of Kings Nower Seed of China, stopped at this same field near Tama, Iowa. The farmer told them he was planting seed corn. With each shovel, Hailong found pay dirt: DuPont Pioneer’s latest parent...