These types of charges don't fall within the scope of a federal Rico.

The vast majority of crimes are typically 5 year statues. Tax evasion allows for a 7 year window statue. For Murder there is NO statue. And rico allows prosecutors to go back decades (provided that the last crime falls within 10 years from the previous crime). Conceivably allowing prosecution dating back decades. 20, 30, 40 years plus on a Rico so long as crime offenses 'touch' each other within 10 years.

There are a few other exceptions. But it's rare.