A petitioner seeking to represent a proposed bargaining unit of employees who are not currently represented must submit a showing of interest of thirty per cent (30%). 456 CMR 14.05(1). However, a petitioner seeking to represent a proposed bargaining unit of employees who are in an existing bargaining unit or to decertify the exclusive bargaining representative must submit a showing of interest of fifty per cent (50%). 456 CMR 14.05(2).
Any employee organization that wishes to intervene in a pending representation case must file a Motion to Intervene within thirty (30) from the date of the Division's Notice of Hearing and submit a ten percent (10%) showing of interest before the Division will permit it to intervene. 456 CMR 14.05(3) and 14.18. However, if the employee organization currently represents the petitioned-for bargaining unit, it need not file a showing of interest with its Motion to Intervene. 456 CMR 14.05(3). See also, Section 1.9. Unless the parties agree and the Division is satisfied that there is good cause for late intervention, the Division does allow any party to intervene after the printing of the ballots.