Rich
I am not sure I like the way conspiracy law is used today, but that doesn't stop it from being the way it is, at least the way I understand it to be.
1) A single working Mom living in a Gang-controlled neighborhood witnesses an LEO being beaten and abducted from her window. She fails to call for help and later tells the cops that she didn't see anything. The LEO is later found executed. As much as we might fault her for lack of co-operation, is she guilty of Misprision of a Felony or Conspiracy to Commit Murder?
If nobody sees her at the window (and maybe even if they do) and she invokes the 5th and keeps her mouth shut, she's uninvolved. But if she screams and points, and a neighbor sees her, then there *is* evidence of something, I'm not sure what kind of crime, though. Should she be punished if found guilty of whatever that is? Yes. Any big city has an anonymous reporting system, and I'm sure they can call 911 from there under this circumstance if the woman is afraid to testify because of the gangs. That is what she should have done. That still leaves a very sticky problem if she is routinely (because she has a window overlooking the scene) interrogated by police. If she doesn't lie, she becomes a witness. That could end her life. If she does lie, she commits a crime. This isnt conspiracy, but I admit I can't call this one.
2) A gun owner cruising the vendor tables at a gun show overhears a man tell a woman, "Buy the Glock 23. I'll pay you later." She purchases it in her name. He's later interviewed by the local police and claims he didn't hear anything. Is he guilty of a Firearms Felony? Should he be?
If there's no other evidence against him, there's no way to prove he lied to a police officer. So he's off. But he's guilty of lying to a police officer if there is a way to prove he heard the man. I don't see conspiracy to violate a firearms law here. The gun owner didn't participate in the plan between the man and woman, he only overheard it. Should he be guilty of anything? That depends on what was taking place. If it was somebody who, by law, is prohibited from possessing a firearm and the woman was a strawman buyer, and he can be proven to have heard and understood what was going on (probably extremely difficult) then he should.
3) Your brother-in-law brags that he won $6K in Vegas and that he didn't report it on his taxes. You're interviewed by the IRS and asked how much he won in Vegas. You answer that you don't know. Are you guilty of Tax Fraud? Should you be?
This is somewhat analogous to 2). If there's evidence you knew and lied (like your brother-in-law, unable to keep his mouth shut, told the police during *his* interrogation that he told you) well, you are guilty of lying to the police. Now, the chances of that ever happening are slim, unless your brother in law hates you and just added your knowledge of the crime in there to drag you down with him. You could always take the 5th and have your attorney argue the prosecutor hasn't proven anything and has only your brother in law's word under interrogation. In my opinion, you shouldn't be, but see below*.
That may sound inconsistent. I think you should be pursued for not pointing out a scheme that was most likely intended to put a gun in the hands of a convicted felon, something with potentially life-threatening consequences for somebody somewhere. I think you should not be pursued for not pointing out a crime that has no potential for violence to anyone.
So it's not inconsistent. I apply that generally. I see a neighbor obviously running a meth lab in his house. I report it. It's immediately dangerous to you and others. I see two guys in a parking lot, one hands money to the other, the other hands a little baggie to the first. It's obviously a drug sale. It's not immediately dangerous to anybody, so I mind my business.
* Regarding ratting on family or friends. I have an ex-wife who lives in a foreign country. She visits about once a year and we're friendly. She once sent me an e-mail containing jokes about terrorism. I didn't reply to it.
When she visited, I took her out in the front yard by the street. I explained that it would be a good idea to keep such topics in mind for the personal visits, and not to send them by e-mail nor to talk about them on the phone. And I added that if she or anyone in her family were doing anything illegal I didn't need to know about it by any means.
That's what I tell all my family and friends. In return, I don't tell them about every stop sign I roll through. That way nobody gets put in the awkward position of having to choose to lie to police or turn in a friend or relative.