[Avodah] Walking in front of a mispallel

[Moshe Yehuda Gluck]

R' Jeff Kaufman:
> It seems to me that the Halacha that it is forbidden
> to walk in front of someone that is davening Shemona
> Esrei has practically been forgotten.
> 
> 1.Does anyone know how and when this happened?
> 
> 2.What is the Limud Zichus for this?

I asked R' David Feinstein a similar question about all the people who talk
Sichas Chullin and Sicha B'teilah in the Bais Ha'K'nesses. (Myself included,
I'm afraid.) He said, "Who says they're doing right?"

KT,
MYG