Those chaperones are usually called commissars.
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Yes, from the ‘movies’, the USSR and German Subs all had at least one ‘party member’ as part of the crew.
You know, the S/A on a Uboat that insisted on a few “Heils” per watch and basically spied on the crew.
Kurt Jurgens “The Enemy Below” ‘solved’ that fanatics whimseys by placing his towel over the swastika
Of course when they had to shoot old laundry and ‘dead’ crewmen out the tubes to ‘fool’ the enemy, the ‘party’ man was more than likely 1st choice amongst the crew...etc...
Also called "minders".