Excerpt from: US Code : Title 18, Section 1159:

"•(a) It is unlawful to offer or display for sale or sell any good, with or without a Government trademark, in a manner that falsely suggests it is Indian produced, an Indian product, or the product of a particular Indian or Indian tribe or Indian arts and crafts organization, resident within the United States."

What is commonly thought ...

Native American symbols are sometimes considered to be up for grabs on the drawing board.  This is a myth.  Symbols and icons are protected by the NA Arts & Crafts Act of 1990. 

Read more about this Act:

Indian Arts & Crafts Act -- Indigenous Art, Inc.

American Indian Art Definitions, Law, Inclusions Policy

The use of Native American Mascots for Sports ...

There is an ongoing argument involving the use of Native American icons for sports mascots. More information involving this dispute can be found at the following resource links:

Indian Arts & Crafts Act -- Indigenous Art, Inc.

American Indian Art Definitions, Law, Inclusions Policy

Crimes Against Humanity - paper -