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The tangential activities that you describe, e.g. communicating, meeting, transferring funds, etc. are the means by which federal officers arrest and convict mobsters/drug dealers/terrorists/etc.
It's very rare to get a conviction on a mobster via a direct mob activity. Instead, the feds use money laundering or tax evasion laws to deal with the mob people so that they can at least do time for _something_. And if they do it multiple times, then they get slapped with RICO and do _real_ time.