It is further agreed that notwithstanding anything else in this Agreement, if at any time in the term of the Agreement, any court or agency shall wholly or partially invalidate the provisions of this Article relating to Union Security, then the NFLPA may reopen this Agreement upon the giving of 10 days’ written notice, with reference solely to the issue of Union Security, and both parties will have an obligation to resume negotiations limited to the issue of Union Security, and both parties will be free to engage in whatever concerted or other action may be permitted by law in support of their positions.