What have been the most important regulations the Government of the United States has enforced for the Institutionalization of Principles of Ethics and cover aspects of Corporate Social Responsibility and National Security?

Work on a Research of 600 words minimum text on the following subject:

What have been the most important regulations the Government of the United States has enforced for the Institutionalization of Principles of Ethics and cover aspects of Corporate Social Responsibility and National Security? In your opinion, what are the most important ones?