I hadn't heard this. If true, it answers my other question, which is why a relatively obscure senator such as Leahy was targeted.
Even the format was copied.
A gentleman I worked with discovered this. He did a "search" on the internet for any site that displayed the addresses exactly as shown in the letters. He found all three names and addresses in a single article formated the way they are done on the letters.
Anytime you come up with a really transparant, and stupid "Blame the Jews" element in anything, it's usually a bunch of Arab Moslems doing the job.