The Sixth Circuit, applying the Supreme Court's 2015 decision in Johnson v. United States, has determined that 18 USC 16(b) - which contains half of the definition of a crime of violence for immigration purposes - is unconstitutionally vague.
The full text of Shuti v. Lynch can be found here:
http://www.opn.ca6.uscourts.gov/opinions.pdf/16a0155p-06.pdf