They may be the Department of Labor, but they have no authority over H-2B labor. Temporary foreign workers are governed by the H-2A (agricultural) and H-2B (non-agricultural) programs. While both programs were originally administered by the Attorney General, the authority was later transferred to the Department of Homeland Security. In 1986, Congress split the agricultural workers into the separate H2-A program and granted the DOL rulemaking authority over those workers alone.
Simple enough, right? DHS governs H-2B, DOL governs H-2A.
Except, it apparently wasn’t that simple for the DOL, which issued rules for the H-2B program in 2011. The 11th Circuit today called that rule-making program ultra vires, which in the arena of administrative law, is fightin’ words.