// Create label operations.
List<CampaignLabelOperation> operations = Lists.newArrayListWithCapacity(
campaignIds.size());
for (Long campaignId : campaignIds) {
CampaignLabel campaignLabel = new CampaignLabel();
campaignLabel.setCampaignId(campaignId);
campaignLabel.setLabelId(labelId);
CampaignLabelOperation operation = new CampaignLabelOperation();
operation.setOperand(campaignLabel);
operation.setOperator(Operator.ADD);