A ward - win ning ▁Tom ▁and ▁Jerry ▁cart oon , ▁The ▁Cat ▁Con cer to , ▁is ▁released ▁to ▁the at res . ▁ ▁May ▁▁ ▁May ▁ 1 ▁– ▁Port ella ▁della ▁G in estra ▁mass acre : ▁The ▁Salv atore ▁Giul iano ▁gang ▁of ▁Sic ilian ▁separ at ists ▁opens ▁fire ▁on ▁a ▁Labour ▁Day ▁para de ▁at ▁Port ella ▁della ▁G in estra , ▁Sic ily , ▁killing ▁ 1 1 ▁people ▁and ▁w ounding ▁ 2 7 . ▁ ▁May ▁ 2 ▁– ▁The ▁movie ▁Mi racle ▁on ▁ 3 4 th ▁Street , ▁a ▁Christ m ast ime ▁classic , ▁is ▁first ▁shown ▁in ▁the aters . ▁ ▁May ▁ 3 ▁– ▁The ▁new ▁post - war ▁Japanese ▁constitution ▁goes ▁into ▁effect . ▁ ▁May ▁ 1 1 ▁– ▁The ▁Ferr ari ▁ 1 2 5 ▁S , ▁the ▁first ▁car ▁to ▁bear ▁the ▁Ferr ari ▁name , ▁deb uts . ▁ ▁May ▁ 1 2 ▁– ▁The ▁animated ▁cart oon ▁film ▁Rab bit ▁Trans it , ▁directed ▁by ▁F riz ▁F rel eng , ▁is ▁released . ▁ ▁May ▁ 2 2 ▁ ▁The ▁Cold ▁War ▁begins : ▁In ▁an ▁effort ▁to ▁fight ▁the ▁spread ▁of ▁Commun ism , ▁President ▁Harry ▁S . ▁Tr uman ▁signs ▁an ▁Act ▁of ▁Congress ▁that ▁implements ▁the ▁Tr uman ▁Do ctrine . ▁This ▁Act ▁gr ants ▁$ 4 0 0 ▁million ▁in ▁military ▁and ▁economic ▁aid ▁to ▁Turkey ▁and ▁Greece . ▁The ▁Cold ▁War ▁ends ▁in ▁ 1 9 9