I understand your point You are right Even if LaRouchePAC is a political web site it can be a reliable source I guess But the fact that this letter is not mentioned anywhere else makes this letter so marginal I would not mention it What is the relevance of this There is not even an article on Tom Jackson on Wikipedia Plus you can only find this letter once on the Net So even if it was written by Thomas Jackson and I am sure it was this is not an important fact I think Wikipedia should stick to important facts And it becomes important when it is mentioned several times in the press