First time I’m reading this info... can’t recall if anyone else has posted it yet, forgive me if it’s a double post!
“Margaret’s father, David Fox, also spoke to Marshall on the phone to make sure his daughter would be in good hands.”
“Fellow officers also attempted to work every angle of the case and found their first suspect, an employee at the A & P named John Marshall. Marshall was eventually cleared after his alibi checked out and he passed a polygraph exam. Some investigators remained suspicious since polygraph testing isn’t always conclusive, however, others believe the true criminal wouldn’t have given his real name.”
“The FBI stepped in to assist on June 28 and began recording phone calls coming into the home. A man with a ransom demand called the day after Margaret’s information was distributed to the local media. The caller demanded $10,000 for Margaret’s safe return. “$10,000 is a lot of bread, but your daughter’s life is the buttered topping,” he said. A few days later, the Fox family received a letter reiterating what the kidnapper had said on the phone: that the money was “a lot of bread” but that Margaret’s safe return was the “buttered topping.” Mary and David Fox waited but never received further instructions from the kidnapper.
A second letter was received soon after the first. It was written to appear as though it had come from the Symbionese Liberation Army (SLA), a small-scale terrorist organization that had kidnapped newspaper publishing heiress
Patty Hearst in California on February 4, 1974. Investigators doubted the SLA’s involvement in Margaret’s disappearance. Police believe either the kidnapper or a prankster mentioned the SLA because the group was frequently in the news. After the second letter arrived there was no further communication.”
https://www.google.com/amp/s/heavy.com/news/2019/06/margaret-ellen-fox/amp/