Why were the navies of 19th/20th century European powers hotbeds of left-wing political activity?

by Normans1066

It’s no secret that leftist ideals were rapidly spreading around the turn of the century; but it seems as though they found a definite home amongst sailors in many European navies. Is there any particular reason for this?

CaptainRhino

u/kieslowskifan has an answer here focusing naval mutinies post-Potemkin:

https://www.reddit.com/r/AskHistorians/comments/5pryo9/why_did_socialist_thought_make_such_inroads/