D.C. Criminal Code § 407

(1)Any person who remains within 100 studs of the Capitol Building or 50 studs of the City Hall, under circumstances that would warrant a reasonable person to believe that the purpose or effect of that behaviour is to enable a criminal street gang to establish control over identifiable areas, to intimidate others from entering those areas, or to conceal illegal activities shall be guilty of Loitering by legislature. (2)This shall be a Class D Offense.