In addition to his political duties Trąbalski worked part-time in between 1894 and 1896 as a teacher of Polish small schools in Leipzig.

His efforts were supported among others by Rosa Luxemburg, Ludwik Warynski, Felix Dzerzhinsky and Julian Balthasar Marchlewski.

When he therefore threatened with arrest, the only 18 year old fled his native Czempin (then part of the Kingdom of Prussia and later German Empire and in 1920, Poland), political opinion, first to Berlin, later on Halle to Leipzig.

[2] Trąbalski made contact with German social democrats, with August Bebel, Johann Karl Pinkau, George Schoepflin, and particularly to Wilhelm Liebknecht, he had a friendly relationship.

In this organization were, inter alia, Rosa Luxemburg in 1900, Hugo Haase and Lenin, who, when he was staying in Leipzig, attended Trabalski.

Immediately after the fall of the socialist law, Franz took effect on 1 October 1890 the SPD again legally operating at.

With the beginning of 1891 he was also a member of the recently founded in Berlin in Germany of Polish Socialist Party (TSP).

In 1901 he was persuaded by the comrades to Katowice in Upper Silesia, to move to the corner of the Three Emperors (Germany, Austria-Hungary and Russia).

Trąbalski was the author of numerous political and socio-political writings, such as: - Mike Schmeitzner/Michael Rudloff: Geschichte der Sozialdemokratie im Sächsischen Landtag.

Jahrgang 1998, ISSN 0942-3060 - Michael Rudloff: Eine Biographie zwischen den Systemen; In: Solche Schädlinge gibt es auch in Leipzig, Frankfurt am Main [u.a.