JPMorgan's top Treasuries trader Rob Allen has been placed on leave amid a compliance review of his electronic messages

· JPMorgan has placed Rob Allen, its top US Treasuries trader, on leave pending a review of his electronic messages, according to people familiar with the matter. 
· Allen didn't return calls seeking comment and a message sent to the JPMorgan email address listed on his Bloomberg terminal profile bounced back. 
· His leave...