Stealing money is theft, see RCW Chapter 9a.56 in Washington, and analogous laws in other jurisdictions. What you describe is theft, as defined under RCW 9A.56.020, and that is a crime. Defenses are available only in case of an open taking made under a good faith claim to title to the property ("it's my money"), or an irrelevant defense related to pallet theft from a pallet recycler. There is no exception arising for goods "in the possession of a criminal organization".
There is also no applicable attainder process for declaring an organization to be a "criminal organization" to which such an exception could be referred, in Washington or any other state that I am familiar with. At the federal level, 18 USC Ch. 96 does not have a provision for declaring some organization to be a "criminal organization", but it does prohibit using proceeds from "a pattern of racketeering activity" that a person or organization participated in, to support a business engaged in interstate or foreign commerce. There is an extensive but specific list of trigger crimes, which are all federal crimes. Supposing that a state wanted to make it legal to steal from criminals, there would have to be a suitable definition of "criminal". Compare the various sex offender laws, where under dell-defined circumstances, a person is legally declared to be a sex offender required to register.
If the property is in fact the proceeds of a criminal activity (not merely "in the possession of a criminal") or is used to support criminal activities, it might be seized under civil forfeiture statutes. However, those statutes only allow the government to seize the property – vigilante civil forfeiture is still theft, a crime for which you can be prosecuted. The state might seize such assets and, when challenged in court, may have to prove that the assets a seizable (this is highly jurisdiction-dependent). The prospects that a prosecutor will turn a blind eye to a theft on the grounds that the victims are criminals is pretty small. More likely, everything gets seized and everybody gets prosecuted.