Born in South Brisbane to Hungarian tailor Julius Isack (known as Isack Julius) and his Romanian-born wife Ernestina, née Lang, he was raised a non-orthodox Jew and attended Leichhardt Street State School, winning a scholarship to Brisbane Grammar School in 1929.
[1] Julius was involved in socialist theatrical productions in the 1930s and he co-founded the Eureka Youth League in 1940 with Connie Healy.
In 1941 his application to join the Queensland Bar was blocked due to his communism; he took the matter to court with Fred Paterson as his counsel.
[1] Julius was involved in the legal case regarding Menzies' attempted dissolution of the Communist Party in 1950–51, and in 1954–55 he cross-examined the Petrovs at the royal commission on espionage.
Julius died at Princess Alexandra Hospital in South Brisbane on 27 February 1963 of myocardial infarction and was cremated.