Native speakers of English, please could you help me with my English?

I am reading a rather complex book about architecture and social issues and find it difficult to understand some phrases. What does the phrase "the sign of an authoritarian brand" mean in this context (does it mean that there was a physical sign next to the article meaning the authoritarian syndicalist movement?).

Le Corbusier's text of La Ville Radieuse, issued as a book in 1933, had previously appeared in instalments under the sign of an authoritarian brand of Syndicalism, first in the monthly journal Plan, and then, after 1932, in Prelude. Le Corbusier, influenced no doubt by the strong Syndicalist traditions of the Jura region, vacillated, like his fellow Syndicalists, between the authoritarian utopian socialism of Saint-Simon and the anarcho-socialist tendencies latent in the writings of Fourier.