Even if the heyday of profitable journalism fact checkers were a magazine thing. Newspapers generally did not use them, they moved too quickly for that and had too much space (newsprint between the ads) to fill.
On the other hand, in that era a much higher proportion of the news in a paper was directly reported by the journalists - things they physically saw, people they physically talked to or called. They weren’t using some half baked thing from the internet because there as no internet. Although they might run something dodgy from another newspaper or wire service, but that was pretty rare, at least outside of the celebrity gossip and film columns (which were, sexist-ly, considered women’s news and thus not held to the same standards).
On the other hand, in that era a much higher proportion of the news in a paper was directly reported by the journalists - things they physically saw, people they physically talked to or called. They weren’t using some half baked thing from the internet because there as no internet. Although they might run something dodgy from another newspaper or wire service, but that was pretty rare, at least outside of the celebrity gossip and film columns (which were, sexist-ly, considered women’s news and thus not held to the same standards).