A very good friend is a La Lèche advisor in a very multi-cultural town. We were working together when 2 of our colleagues were in tears, because they were not allowed/prevented to BF my their MIL- as they lived together. OH then told us he had come across this many times, again, in multi-extended families with an Asian background. Friend above has seen come across this multiple times, hence my mention. So it seems it is quite common in some cultures.
But both OH and her, currently, not many moons ago- is called to help mothers who want to BF, and their OH, mothers, or Mils, or others- are constantly undermining them, telling them they are doing the baby no good, buying formula and bottles, and handing them to the mother. Usually by those who chose not to BF, or didn't succeed, or by OH's who want their wives to keep breasts for them, perhaps? Or because they have no control. Or ?????
As said, it seems much more common than the other way round. Not just in the 70s, but since then and currently.