This minority which still believed in abstentionism , called themselves Republican Sinn FÃ in ( or Sinn FÃ in Poblachtach in Irish ) , and saysy that they are the true Sinn FÃ in . This minority , which rejected dropping the policy of abstentionism , now nominally distinguishes itself from Provisional Sinn FÃ in by using the name Republican Sinn FÃ in ( or Sinn FÃ in Poblachtach ) , and maintains that they are the true Sinn FÃ in republicans .