My sister is working for a store paying her below min wage?

Hi I was wondering what can I do to help my sister het boss pays her $5.25 an hour she would work up to 18 hrs a day no break no lunch he pays her cash and treat her like crap he also has illegals working their and they are also selling liquor with out their Tabc certficiate hes already been warned once that he needs to pay min wage and the ppl working their must have.papers he also took money from an cancer organization that left their can to collect money to bu beer for the store !!!!!!!!please help dont know what to do.