Actually there's executive orders, that in case of an emergency declare by the government, the government has given itself permission to order you to surrender to the government all stored food, fuel, etc.
FEDERAL EXECUTIVE ORDERS
10995 Seizure of all print and electronic media in the United States
10997 Seizure of all electric power, fuels, and minerals, public and private
10998 Seizure of all food supplies and resources, public and private, including farms and equipment.
10999 Seizure of all means of transportation, including cars, trucks or any other vehicles, including control over highways, harbors, and waterways.
11000 Seizure of all American people for work forces under federal supervision; it allows the government to split up families if they believe that it is necessary.
11001 Seizure of all health, education, and welfare facilities, public and private.
11002 Registration by the Postmaster General of all men, women, and children for government service.
11003 Seizure of all airports and aircraft.
11004 Seizure of all housing and finance authorities; authority to establish forced relocation, designate areas that must be abandoned as 'unsafe'. Establishment of new locations for population groups, building of new housing on public land.
11005 Seizure of all railroads, inland waterways, and storage warehouses, public and private.
11051 Authorize the Office of Emergency Planning to put the above orders into effect in times of increased international tension or financial crisis.