# AccessControlSubjectUnion

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Reference](https://developer.m-files.com/APIs/gRPC-API/Reference/index.md) > [Messages](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.AccessControlSubjectUnion/

Union for ACL subject data depending on the subject type.

- **Full name:** `MFiles.AccessControlSubjectUnion`
- **Proto file:** [`mfiles/structs.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/structs.proto)

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## Fields

| Field | Type | Number | Description |
|---|---|---|---|
| <a id="f-user"></a>`user` | `int32` (oneof data) | 1 | User ID. |
| <a id="f-user_group"></a>`user_group` | `int32` (oneof data) | 2 | Group ID. |
| <a id="f-pseudo_user"></a>`pseudo_user` | [`AccessControlPseudoUserSubject`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.AccessControlPseudoUserSubject/index.md) (oneof data) | 3 |   |

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## Used in fields

- [`AccessControlSubject.data`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.AccessControlSubject/index.md#f-data): Subject data.