▁lost , ▁until ▁it ▁came ▁to ▁light ▁in ▁ 1 9 2 3 . ▁D vo ř ák ▁himself ▁had ▁died ▁in ▁ 1 9 0 4 , ▁having ▁never ▁heard ▁his ▁first ▁sym phony ▁performed . ▁ ▁Sach s ▁was ▁said ▁to ▁have ▁" t act fully ▁… ▁made ▁[ a ] ▁few ▁essential ▁em end ations ▁and ▁abbre vi ations " ▁to ▁the ▁score . ▁ ▁In ▁the ▁ 1 9 3 0 s , ▁he ▁was ▁considered ▁the ▁most ▁important ▁member ▁of ▁the ▁Jewish ▁community ▁involved ▁in ▁music ▁in ▁Zag reb . ▁ ▁He ▁conducted ▁the ▁first ▁performance ▁of ▁Wagner ' s ▁Par s if al ▁in ▁Zag reb . ▁ ▁During ▁World ▁War ▁II , ▁as ▁a ▁Jew , ▁Sach s ▁converted ▁to ▁Catholic ism ▁in ▁attempt ▁to ▁save ▁himself ▁from ▁per sec ution ▁by ▁the ▁Independent ▁State ▁of ▁Cro atia ▁regime . ▁For ▁a ▁time ▁he ▁was ▁shelter ed ▁at ▁the ▁w ard ▁of ▁o ph th alm ologist ▁Dr . ▁Vil ko ▁Pan ac ▁in ▁the ▁Sister s ▁of ▁Char ity ▁Hospital ▁Zag reb . ▁Later ▁D ido ▁K vat ern ik ▁interven e ▁on ▁beh alf ▁of ▁Sach s ▁and ▁his ▁wife ▁to ▁be ▁ex cluded ▁from ▁the ▁per sec ution . ▁ ▁He ▁was ▁President ▁of ▁the ▁Cro at ian ▁Society ▁of ▁Music ▁Art ists ▁ 1 9 4 5 - 4 8 , ▁and ▁he ▁was ▁instrument al ▁in ▁the ▁development ▁of ▁the ▁Zag reb ▁Opera ▁after ▁World ▁War ▁II . ▁ ▁He ▁was