Green’s Dictionary of Slang

1. (US, also long-snout) a Jew [physical stereotype].

1867

Nat. Police Gaz. (NY) 30 Nov. 6/1: ‘Vot for you take von pox of mine segars’ [...] angrily inquired long-nose No. 1, shaking his unwashed ‘mauley’ in the mug of ‘long-snout’ No. 2.

2. (US) an upper-class person, an aristocrat [long-nosed adj.].

1935

(con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 595: And, say, was I ready to stand up and give three cheers when that long-nose ended his spiel?