Prior to the construction of the Berlin Wall in 1961, travel between the Eastern and Western sectors of Berlin was completely uncontrolled, although restrictions were increasingly introduced by the Soviet and East German authorities at major crossings between the sectors.
Sebelum pembangunan Tembok Berlin pada tahun 1961, perjalanan antara sektor Timur dan Barat Berlin secara bulat tak dikontrol, meskipun pembatasan secara meningkat diperkenalkan oleh otoritas Soviet dan Jerman Timur di perlintasan-perlintasan besar antara sektor-sektor tersebut.