If I may ...
The feds aren't trying to ban anything, just illegally stop the use of.
The Feds are trying to usurp commerce law. These biker "clubs" are basically private member clubs that have membership dues. The logos are representative of the concern. Even if they were never registered, or trademarked, they would still have protection because of "first use in commerce". The government can not claim rights to anything they haven't used, or are planning to use, unless it belonged to them from the beginning, just like you or me.
Saying the use of their logos furthers criminal enterprise is a seriously laughable joke. How about Bank of America, JP Morgan Chase, Citi, and many other type business logos? Talk about a criminal enterprise.