He served on the Italian Front in the First World War, studied philosophy in Graz and did unskilled labour in a factory before working as a provincial journalist and then on the Arbeiter-Zeitung from 1927.

Gustl Deutsch, an Austrian who had been arrested and imprisoned, had managed to smuggle him a note to alert him to the danger facing Fischer.

Although the charges were completely false, by being accused, Fischer was in grave danger and he immediately sought help from Georgi Dimitrov, one of the leaders of the Comintern.

Revolutionäres Frauenleben zwischen Wien, Berlin und Moskau ("Blue Blood and Red Flags.

Being a former associate of the moderate wing of the KPÖ, Fischer gradually moved to the "undogmatic Marxists" in Austria and even renounced the concept of a dictatorship of the proletariat.

[8] He continued to publish the monthly journal Wiener Tagebuch with Franz Marek and played a role in the public sphere primarily as an undogmatic Marxist theorist.