CHANDIGARH: The Congress, which is hoping to win the Punjab Assembly polls next year, has introduced a "loyalty bond" that all the ticket hopefuls will have to sign for their candidature to be accepted. An aspirant has to give an undertaking and pledge that if he/she is not elected as the official Congress candidate for any constituency, he/she will not contest as an independent candidate, and will fully support the one elected as the nominee. Former CM Amarinder Singh said the party would take strict action against rebels.