The above posts are correct. I know there are plenty of leagues that use a league vote or a board vote to review trades. This leads to nothing but trouble as well. The only way you should ever overturn a trade is if there is obvious collusion.
And here is the problem with that, it is very hard to prove collusion anyway. Unless an owner just comes out and admits it.
No one (even the commissioner) should have the right to tell another owner how to manage his team. He paid his money, just like everyone else, what gives anyone the right to determine how he manages his team as well? You can't write rules into your league to cover stupid trades. It's not even week one, so you know the guy is trying to win still. It is not like he is in last place and its late in the season and he just doesn't care any more.
How are you to know that Rudi doesn't blow out his knee in week one and Braylon Edwards and Caddy go on to have stellar seasons? Is that unlikey, yes. But you don't know for sure. How would you guys feel if you didn't allow this trade and the above scenario plays out and you just cost this guy the championship because you stopped this trade in Week 1.
I am a commissioner for 5 leagues and lopsided trades are the biggest headache any commissioner will ever experience. It makes things extremely tough for the commissioner, all the other owners complain to you about it. The owner making the bad deal is getting ridiculed and the owner getting best of the deal is in a defensive position as well. These deals bring out the worst in everyone, especially if there is a decent amount of money on the line.
Committee or league votes are no good either. Everyone looks at trades from a their own perspective. They really do not have a partial view. Let's say the trade is with the 3rd place team and an 8th place team, with the 3rd place team really making out on the deal and you put this up to a league vote. I can already tell you how most of the votes on this kind of trade will play out based on just the standings. The teams at the top will more than likely vote NO to the trade because they do not want to see this playoff team get any stronger, unless their is a truly dominant team already in 1st place that people do not like. If that is the case everyone will vote yes so that this underdog team can bring down the league giant.
If you still really need to get another person to break this tie, there are sites out there like this one,
http://www.fantasysportstrophies.com/fantasyjudge.html that act as fantasy football judges for a small fee, usually less than $10 they will look at your issues and make a ruling. There are a few different ones out there, some are a collection of other fantasy league players, some are lawyers who do fantasy football, etc.
FYI - The trade you are asking about isn't even that lopsided a trade, (it may turn out that way but who knows, these things have a way of working out on their own) so if you are already sweating this one, you may want to revisit how trades are going to be handled in your league. Personally, i would get rid of the league vote thing and leave it up to the commissioner, provided the commissioner is a fair and honest person. If he is a little sketchy, i would move to use one of these fantasy judge services and if a questionable trade comes up it goes to this service to decide.