15 USC 1674 - Restriction on discharge from employment by reason of garnishment

(a) Termination of employment 
No employer may discharge any employee by reason of the fact that his earnings have been subjected to garnishment for any one indebtedness.
(b) Penalties 
Whoever willfully violates subsection (a) of this section shall be fined not more than $1,000, or imprisoned not more than one year, or both.