Problems in the administration committee of one of the mosques

We have a small  Mosque ( Inside a House ) in our Town .We also have a land and some money to build a new Mosque witch was collected over the years for that purpose. We have a Mosque Committee elected yearly as well as  Five member Permanent Board of Trustee, This Board was appointed 6-8 years ago when there were very few muslims in this town, Some of the members of Trustee who have left the town were replaced by the some members of Board of Trustee without holding any elections and obviously they have given these posts to the persons of their own choice, since than this Board of Trustee has virtually ruled this mosque because they have formed the constitution of the mosque according to their own convenience  e.g., They only allow  those members of the mosque to vote for committee who have been living in this town for more than  3 years, in that way only their approved persons could contest and vote in  the election and people were seeing the same faces for years. About a year ago because of the pressures they allowed everybody to vote and in that way a new committee was elected.
After that elections it was revealed that the money for the new mosque has been put in a Saving Account which is drawing  Interest ( Riba ) . Initially The Board Of Trustee   ( from whom only 1-2 comes regularly to the Mosque  unfortunately  ) who are the ones to operate the account denied that we are getting  Riba , than the active member of the Board who is wealthy and influential person of the town accepted that they have put the money in that account because they have Fatwa  from  Al Azhar that getting Riba in USA Banks is allowed