Sure we have, serfdom. Serfs were not only expected to provide labour to their “employers”, but to fight for them, believe what they believe, and pledge their fealty.
Like serfs, and unlike the period from the industrial revolution to the postwar years, it’s becoming less common for people to change careers, an occupation being more than a job and becoming an identity. Sure we might change employers frequently, but it is not often (and is in fact a spectacle) when someone makes a drastic change of occupation.