# CreateWorkerBlock
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## Description
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The `CreateWorkerBlock` operation allows you to prevent a Worker from working on your HITs. For example, you can block a Worker who is producing poor quality work. You can block up to 100,000 Workers.

## Request Syntax
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```
{ 
  "WorkerId": {{String}},

  "Reason": {{String}}
 }
```

## Request Parameters
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 The request accepts the following data in JSON format: 


| Name | Description | Required | 
| --- | --- | --- | 
|  ` WorkerId `  | The ID of the Worker to block<br />Type: String | Yes | 
|  ` Reason `  | A message that explains the reason for blocking the Worker. The Worker does not see this message.<br />Type: String | No | 

## Response Elements
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 A successful request for the `CreateWorkerBlock` operation returns with no errors and an empty body.