▁National ▁Gy psum , ▁La far ge ▁North ▁America ▁and ▁Georgia - P ac ific ), ▁was ▁accused ▁in ▁a ▁class ▁action ▁for ▁alleg edly ▁viol ating ▁federal ▁ant it rust ▁laws , ▁through ▁raising ▁prices ▁on ▁dry wall ▁products ▁by ▁as ▁much ▁as ▁ 3 5 ▁percent , ▁as ▁well ▁as ▁hal ting ▁a ▁long standing ▁practice ▁of ▁letting ▁customers ▁lock ▁in ▁prices ▁for ▁the ▁duration ▁of ▁a ▁construction ▁project . ▁US G ▁stated ▁that ▁it ▁did ▁not ▁particip ate , ▁or ▁eng age ▁in , ▁any ▁un law ful ▁conduct . ▁ ▁Host ile ▁take over ▁attempts ▁In ▁November ▁ 1 9 8 6 ▁the ▁Bel z berg ▁brothers ▁of ▁Canada ▁attempted ▁a ▁host ile ▁take over ▁of ▁US G . ▁US G ▁immediately ▁instit uted ▁a ▁plan ▁to ▁buy ▁back ▁ 2 0 ▁percent ▁of ▁its ▁common ▁stock ▁in ▁an ▁effort ▁to ▁f end ▁off ▁the ▁take over . ▁By ▁December ▁ 1 9 8 6 , ▁however , ▁US G ▁had ▁purchased ▁Samuel , ▁William , ▁and ▁H yman ▁Bel z berg ' s ▁ 4 . 9 ▁percent ▁st ake , ▁for ▁$ 1 3 9 . 6 ▁million . ▁ ▁In ▁October ▁ 1 9 8 7 , ▁Texas ▁oil man ▁Cy ril ▁Wagner , ▁Jr . ▁and ▁Jack ▁E . ▁Brown , ▁through ▁Des ert ▁Part ners , ▁LP , ▁attempted ▁a ▁host ile ▁take over ▁of ▁US G , ▁bu ying ▁ 9 . 8 4 % ▁of ▁US G ' s ▁out standing ▁stock