Originally laid down at No. 820 shipyard in Kaliningrad, USSR on 24 March 1954, the Tur was the eleventh of the Pr. 50 (Riga-class) frigates built for the Soviet Navy. After just two years of service with the Red Navy, she would be sold to the German Democratic Republic, who renamed her Karl Marx in honour of the German father of communism. Karl Marx served uneventfully until 1971 when she was decommissioned and sold for scrap.

Introduced in Update "Wind of Change", the Karl Marx is identical to her sister ship the Yenot in the Soviet tree. Being a frigate, the Karl Marx primarily excels at taking out coastal vessels at range thanks to her 100 mm cannons with reasonable rate of fire. Although she only has HE shells at her disposal, the Karl Marx is still capable of holding her own against destroyers at range, though she can still be easily overwhelmed if her turrets are disabled. Thus, unless you are pushing for a coastal area, it is better to stay behind friendly destroyers to shield yourself from enemy fire.