pickup on south street ( 1953 ) and direct by movie maverick samuel fuller and contain a stunning opening that establish a double complication . subway rider candy ( susan peter ) collides with pickpocket skip mccoy ( richard widmark dip in shade of sinatra cool ) . she unaware that she carry valuable microfilm while mccoy be unaware of grifting it . both be unaware of be observe by two federal agent . thus the grift set in motion a degree of knowledge . candy be doubly watch ( skip and the police ) and therefore doubly naive while skip and the overconfident petty thief and be singularly unaware and trail by federal agent while the fed and all knowing and be ultimately helpless . they can not stop the passing of government secret or the spread of communism .