Given so many high profile baddies go down on RICO cases, I wonder if these requirements are in support of this? If the Mob is clearly instructed to pay tax on

Given so many high profile baddies go down on RICO cases, I wonder if these requirements are in support of this? If the Mob is clearly instructed to pay tax on their pilfering, and they don't, then it may be easier to get them on the tax evasion than the pilfering?