Buell Frazier said that Fritz threatened him if he, Frazier, didn't sign a confession. In fact, threatened to beat him.
I always wondered given the terrible racism at that time why they didn't coerce/intimidate the black workers (even others) to implicate Oswald. Like they allegedly did to Frazier. The black workers were, of course, particularly vulnerable to this. So force them to say they saw Oswald with a long package that day, that he expressed hatred towards JFK, they saw him steal some wrapping paper, even that they saw him (or heard someone) go down the stairs after the shooting. Anything. After all, the claim is that Oswald was railroaded, not given consul, evidence planted, he was a patsy. So what about the black workers?
But nothing. Nothing they said really implicated Oswald in any way. In any trial, they would likely be called as defense witnesses.