All the general penal statutes relating to crimes and offenses against the United States shall apply with respect to the Corporation, its property, money, contracts and agreements, employees, and operations: Provided, That such general penal statutes shall not apply to the extent that they relate to crimes and offenses punishable under subsections (a), (b), (c), and (d) of this section: Provided further, That sections
431 and
432 of title
18 shall not apply to contracts or agreements of a kind which the Corporation may enter into with farmers participating in a program of the Corporation.