So how is that connected to this? More to the point where is the evidence that this murder was the work of a hate group?
There is no direct evidence...yet. The two are connected because Hale attempted to have Lefkow killed after she upheld a ruling that stated he could no longer use "World Church of the Creator" as the name of his white supremacist organization. Now that he's only a month away from sentencing, her husband and mother are dead. That is at least a moderately strong circumstantial link.