lib/AmazonSNS.php
public function removePermission($topicArn, $label) {
		if(empty($topicArn) || empty($label)) {
			throw new InvalidArgumentException('Must supply a TopicARN and Label to remove a permission');
		}

		$this->_request('RemovePermission', array('Label' => $label));

		return true;
	}
public function removePermission($topicArn, $label) {
		if(empty($topicArn) || empty($label)) {
			throw new InvalidArgumentException('Must supply a TopicARN and Label to remove a permission');
		}

		$this->_request('RemovePermission', array('Label' => $label));

		return true;
	}
Remove a set of permissions indentified by topic and label that was used when creating permissions

@link http://docs.amazonwebservices.com/sns/latest/api/API_RemovePermission.html
@param string $topicArn
@param string $label
@return bool
@throws InvalidArgumentException