▁Catal á ▁( P CC ), ▁B loc ▁O br er ▁i ▁Cam per ol ▁( BO C ) ▁and ▁the ▁Iz quier da ▁Comun ista . ▁Com or era ' s ▁US C ▁took ▁the ▁position ▁that ▁the ▁Social ists ▁should ▁un ify ▁into ▁one ▁group , ▁the ▁Commun ists ▁into ▁another , ▁and ▁then ▁the ▁two ▁groups ▁should ▁join . ▁This ▁was ▁the ▁start ▁of ▁extended ▁negoti ations ▁in ▁which ▁a ▁l ia ison ▁committee ▁was ▁formed ▁to ▁resolve ▁issues ▁between ▁the ▁Social ist ▁groups . ▁The ▁growing ▁strength ▁of ▁the ▁T rot sky ist ▁PO UM ▁( Part ido ▁O br ero ▁de ▁Un ificación ▁Marx ista , ▁Work ers ' ▁Party ▁of ▁Marx ist ▁Un ification ) ▁encourag ed ▁the ▁P CC ▁to ▁enter ▁into ▁negoti ations ▁with ▁the ▁l ia ison ▁committee . ▁On ▁ 2 4 ▁November ▁ 1 9 3 5 ▁the ▁committee ▁held ▁a ▁meeting ▁in ▁Barcelona ▁which ▁the ▁P CC ▁was ▁invited ▁to ▁attend . ▁Com or era ▁wrote ▁from ▁prison ▁ur ging ▁a ▁quick ▁union ▁of ▁the ▁groups , ▁and ▁the ▁P CC ▁joined ▁the ▁committee ▁in ▁the ▁first ▁half ▁of ▁January ▁ 1 9 3 6 . ▁ ▁When ▁the ▁Popular ▁Front ▁gained ▁power ▁in ▁February ▁ 1 9 3 6 ▁Com or era ▁was ▁released ▁and ▁returned ▁to ▁the ▁Ministry ▁of ▁Agricult ure ▁and ▁Econom y . ▁Com or era ▁led ▁the ▁US C ▁into ▁un ification ▁with ▁the ▁Pro let arian ▁Catal an ▁Party ▁( Part it ▁Catal à ▁Pro