The artist's name on the poster is not indicated. By assigning Artist Unknown to a poster it also could mean the artist used a chop mark whereby no signature is seen thus rendering the artist's identity anonymous.
The Typography Workshop named for Ivan Fedorov was at 11 Zvenigorodskaia Street in Leningrad and was named for Ivan Fedorov (c.1525-1583) who is historically referred to as the "first" Russian printer. Prior to the workshop's nationalization, it belonged to the firm of Roman Golike and Artur Vilborg. Immediately after nationalization, the workshop became the 15th State Typography Workshop in the period after the Russian Revolution, and it subsequently was named the 3rd Typography Workshop in its later years.
For backstory, please see the entries for State Publishing House, Moscow and State Publishing House.