'Removes a statement from a topic\'s access control policy.
:type topic: string
:param topic: The ARN of the topic.
:type label: string
:param label: A unique identifier for the policy statement
to be removed.'

def remove_permission(self, topic, label):

    params = {'TopicArn': topic, 'Label': label}
    return self._make_request('RemovePermission', params)
