from typing import Dict


def get_request_organization_id(request_data: Dict) -> str:
    """
    Get the organization ID from the request data.

    Args:
        request_data (Dict): Request data as a dictionary.

    Returns:
        str if organization_id is included in request_data.

    Raises:
        rest_framework.serializers.ValidationError if organization ID is not
        included in the request data.
    """
    organization_id = request_data.get('organization_id', None)
    if organization_id is None:
        raise serializers.ValidationError('organization_id is required')  # type: ignore
    return organization_id