I wish there was a way to ignore a specific requester all together from showing up on available HITS. For example, I always get frustrated with requester "Dolores Labs" and they have so many HITS available that it becomes a task in itself to find a HIT by another requester that is legit. Maybe it's just me, but I think it would be nice!
You will find a 'Hide Requester' script in the 'Scripts' section. Follow the instructions and use that script to avoid Requesters you don't want to see on your Hits page.