This bill amends the Immigration and Nationality Act to define "criminal gang." An alien who is or was a member of a criminal gang, or who participated in gang activity knowing that such participation will promote the gang's illegal activity, shall be inadmissible and deportable. The Department of Homeland Security may designate a group or association as a criminal gang. Detention shall be mandatory for anyone found inadmissible or deportable for criminal street gang membership. Individuals found inadmissible or deportable for criminal gang membership shall be barred from: asylum; withholding of removal; temporary protected status; special immigrant juvenile status; deferred action; and parole, unless assisting the United States in a law enforcement matter and required by the government to be present with respect to such assistance. An alien found at a U.S. land border or port of entry who is determined to be inadmissible and a threat to public safety (certain criminals, terrorists, street gang members) shall be subject to expedited removal.