Question: Has a new crime mandating prison time ever been created by an "Executive Order" before?

[onenote]

16. I'm quoting the executive order.

Which doesn't "create" a "new law" but directs law enforcement to aggressively pursue existing laws against flag burners, such as laws against property damage. As I noted, that doesn't mean the enforcement efforts made pursuant to the EO will be constitutional. But they won't be based on any "new" laws.

Here's an example of a flag burning case where, prior to Trump's election, the defendant was convicted of violating an existing criminal statute;
https://www.justice.gov/usao-dc/pr/rioter-federally-charged-damaging-us-government-property-union-station