Well, to start with, the zeitgeist of the times - https://dash.harvard.edu/bitstream/handle/1/8846774/Wall.htm... Then you can look at the consumer complaints to the US Government which spurred Congressional hearings in 1965 bringing about the Fair Packaging and Labeling Act, where just for example, a consumer complaint testified that "As if bacon packaging wasn't deceptive enough, <*> has the practice of putting pieces of 100% fat slapped together under the bacon completely out of sight", among so many others. Get those transcripts. Personally, the only reason I am aware of it was that it was on the news, and I was a kid; I mean, the news was only 30 minutes nightly so topics like Vietnam got airtime and were memorable; upset consumers I do remember. In those days, I think, bacon was a necessity, very much a staple, more so than today because of meat or nitrate avoidance - it is what you had for breakfast; people knew how to buy bacon as they had been buying it from a butcher directly, could gauge lean/fat ratio and had very high expectations, but apparently were being ripped off. You'd have to find those newsreels to verify my claims.