>>2439898During October 1899, he worked as a meteorologist at the Tiflis observatory (Deutscher 1966, p. 54; Conquest 1991, p. 27; Service 2004, pp. 43–44; Montefiore 2007, p. 76; Kotkin 2014, pp. 47–48.)
Rothschild refinery storehouse, where he co-organised two workers' strikes. (Montefiore 2007, pp. 90–93; Kotkin 2014, p. 51; Khlevniuk 2015, pp. 22–23.)
These are anti-Stalin sources btw who would be highly motivated to say he wasn't working class, yet even they say he was working class. So if that does not satisfy you, I do not know what will.
The idea stated in this post
>>2439893 that Stalin went from seminary school to robbing banks is completely ludicrous. He left seminary in 1899 and only partook in one bank robbery that we know of in 1907, the Tiflis bank robbery, where he played a mostly auxiliary role, standing off to the side and phoning Lenin when the job was complete. It was his friend Kamo who actually partook in the direct action of the robbery.