Well,
a side question: why did Micheal dicide to move out of New York after the Great Massacure? After the GM, he was NO.1 family in New York and the moving action will surely make the cops suspect him of mass murders.
The move to Nevada was Michael's major attempt to make the Corleone Family "completely legitimate." He turned over the operation of the "olivo oil business" (the family's traditional rackets such as gambling and unions) to Clemenza. He still controlled NY rackets, even more than before he whacked the other Dons, but he was now doing it long-distance through Clemenza.
Leaving NY actually made Michael less suspect with the police. Of course he had an alibi when the massacre occurred (he was in church!!). But, if the authorities suspected him of ordering the massacre, his move to Nevada could indicate that he was actually abandoning the NY Mafia life. No law enforcement official with any brains would believe that, but that would be the way it looked.
