DOJ sends letter in CT Senate race

The Justice Department has injected itself in the Connecticut race for US Senate.  Here is the letter.

This letter has caused concern  among unpredictable quarters.  The Professor wrote “So I was surprised when DOJ sent this warning letter to WWE. I wonder whether others have gotten such a letter.”
 
Normally, a law enforcement agency, especially the DOJ, would not inject it self with criminal threats so close to the election.  Would welcome other thoughts on this one.