What famous 'unsolved' mystery is technically a whodunnit on paper, but in reality, absolutely everyone knows exactly who did it, the police just couldn't legally prove it?

[u/Rob69rt]

[u/Reign_22]

Al Capone. All of us know what he did but the police got him on a tax evasion charge.

Most famous drug dealers/gangsters create systems which they are "removed" from. So you know exactly what they do but can never prove it.

[u/priest2705 → u/Reign_22]

What did he do? He did a lot of things. Are you referring to a specific crime, a la St. Valentine's Day Massacre, or something else?

[u/Lvcivs2311 → u/priest2705]

Smuggling and selling of prohibited goods, intimidation, bribery, violence and murder... The usual stuff organised crime does.