Most hacker groups [resourceful govt and their employees you really mean] usually have insiders to assist them to help perform the hack [inside secret govt helpers in large companies] which is why these operations are seriously complicated and not easy to pull off.
If us govt employee/s in addition to the crime of theft [the range of punishment depends on the amount] the crime of hacking, there is [if done on a us citizen] the deprivation of constitutional rights, which if in conspiracy carries up to ten years in prison. [obviously, they could not be a law enforcement if they did that]
Do you guys mean a white hat hacker or the gray hat hacker? Anyway, most hackers have their own leader and probably from the government while some of them are from a group of people who do have knowledge about programming.
And for OP, this link might help to your question:
https://www.quora.com/What-would-happen-if-the-BlockChain-were-hacked