Since Hobbs Act robbery is rarely used in cases of merely threatened harm, convictions under the act are categorically convictions for a crime of violence.
Hobbs Act robbery conspiracy is a crime of violence, as it necessarily creates a substantial risk of violence.
As statute requires that the number of predicate convictions be determined by the finder of fact in the present trial and conduct-specific aspects of the prior convictions are balanced in this determination, many of the constitutional difficulties with prior convictions under a residual clause can be avoided. The fact that the predicate convictions weren't determined by the finder of fact in this case was harmless error.
http://www.ca2.uscourts.gov/decisions/isysquery/82545afb-53b7-40bc-96c2-b5760539665a/1/doc/14-2641_opn.pdf#xml=http://www.ca2.uscourts.gov/decisions/isysquery/82545afb-53b7-40bc-96c2-b5760539665a/1/hilite/
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.