Trouble understanding a sentence, notably 渡さんぞ

Question

「積み荷は渡さんぞ、この泥棒めが！」

I have trouble with two parts:

1. 渡さんぞ, what is the idea for this construction, I just don't understand. It seems like it's coming from 渡す and some kind of mix between the んだ form and ぞ.
2. 泥棒め, why use め after the noun. Does it have the same function as め after adjectives to say "some kind of", if it does why every lessons only talk about adjectives?

I think it translates to something like "I'm carrying a cargo, you thief!" or something like that but I don't understand the grammar involved.

Answer 1

I did more digging and I understand it now.

1. It seems like 渡さん is indeed a shortened version of 渡さない. According to this thread, you will sound old and formal if you use it, which corresponds to the story since it's an old merchant carrying some kind of caravan.

2. According to this post, "め is a suffix of contempt when attached to a noun or another person's name".

With all this in mind, I can confidently say the translation would be: "I won't hand the cargo to you, stupid thief!". I believe that last が is for the subject, but it's put at the end to make emphasis on the thief.