Famous names like Tarmac Plc , Costain Group Plc and ARC , a unit of conglomerate Hanson Plc , have all been targeted .
<response> Famous names like <organization>Tarmac Plc</organization> , <organization>Costain Group Plc</organization> and <organization>ARC</organization> , a unit of conglomerate <organization>Hanson Plc</organization> , have all been targeted . </response>