Blocking a Worker
If Workers aren't performing to your standards, you can block them from working on your Human Intelligence Tasks (HIT).
Blocking a Worker prevents the Worker from accepting more of your HITs. However, it does not prevent the Worker from submitting assignments that they accepted before you blocked them.
To block a Worker
On the Mechanical Turk Requester website https://requester.mturk.com/, click the Manage tab and then click Workers.
The Manage Workers page appears.
On the Manage Workers page, click the Worker ID of the Worker you want to block.
The Manage Individual Worker page appears.
Click Block Worker.
The Block Worker dialog box appears.
Enter a reason for blocking the Worker and click Block. A message with the reason you are blocking is sent to the Worker.