Barmen

A Rhineland textile-manufacturing town where Friedrich Engels was born in 1820 into the very industrial bourgeoisie his life's work would be spent indicting, his family owned the mills he later sent Marx money from.

Barmen was a textile town in the Wupper valley, crowded with mills and with the Pietist religion that ran alongside them, and Engels was born there in 1820 into a family that owned some of those mills. He was sent to Manchester to learn the firm and used the time to walk the slums and write The Condition of the Working Class in England. He then spent twenty years in the business he despised, largely to keep Marx and his household from going under.