Exceptions to application of part.

Nothing in this part shall apply to any person, firm, joint-stock company, incorporated society, credit union, or corporation doing business in the District of Columbia under the supervision of the Federal Reserve System, or the Comptroller of the Currency, or the Federal Deposit Insurance Corporation, or the Federal Home Loan Bank Board, or the Federal Savings and Loan Insurance Corporation, or the Department of Health and Human Services or to loans made by them.