Note that the "Russian Jew" became an issue in Scotland (and many other places) just about the apparent time of composition of this song. Following the assassination of Tsar Alexander II in 1881, anti- Jewish riots (pogroms) in the Jewish pale of settlement* led to many Jews emigrating. Most wanted to go to the USA, but lack of money and swindling shippers landed many of them in the UK, often practically destitute. Glasgow rather than Aberdeen would have probably been the main area of potential conflict, but everyone would have known about it. There's a very good book covering this: Be Well, by K E Collins.

I'm not trying to spoil a fun song, but remember the dark background. The Irish got similar treatment after the Famine.

*Observe that the Russians knew very well then that Ukraine, the Baltic lands, Poland, Bessarabia etc weren't part of "Holy Russia", and therefore wouldn't be polluted by Jews.