My Blogger site, xxxxxxx . blogspot . com, with over 8 years of blog posts archived, has been redirected without my permission, to "kunoichi . info". I see my blog for a few seconds before it goes to the new site.
If we use a text only browser, such as an HTTP trace utility, the offending code is directly visible. Here's an example, taken from the latest forum problem report (and rigourously redacted).
<div class='widget HTML' id='HTML2'>
<h2 class='title'>Recent Comments</h2>
So far, identification and removal, of the problem code, seems to be straightforward - just access the "Page Elements" wizard (Classic Blogger GUI) or the "Layout" menu wizard (New Blogger GUI), find the offending gadget, and remove it. As always, you are advised to clear cache and restart the browser, after removal and before testing.