Workplace enforcement operations. >> the directive comes after 680 people were detained at seven meat processing plants in mississippi. these factories, they're the economic epicenter for these communities with so many now unemployed, the entire region is feeling the effects. cnn nick valencia has this. >> reporter: 680 undocumented immigrants detained on the outskirts of jackson, mississippi, all workers from food processing plants in what the u.s. attorney here called the largest single state operation in i.c.e. history. >> now, while we are a nation of immigrants, more than that, we are fir...