Whenever it shall appear to the Administrator that any violation of the act should be reported to the United States Department of Justice for appropriate action, he shall serve notice in writing upon the person apparently responsible for the alleged violation and shall give such person an opportunity to show in duplicate to the Administrator within 20 days after the receipt of such notice why the alleged violation should not be reported to the Department of Justice. The person so notified may within the period stated apply for an opportunity to present his views in person, or by his attorney. If the Administrator deems the request appropriate he will designate a time and place for hearing the applicant.