[rtkwe]

FCC violations are generally fines instead of prison time. It'd be somewhat effective but not nearly as powerful as the tax evasion charges.

[Aloha]

People have been jailed for violating the ham radio rules.

[hatsunearu]

Any sources? The crazy 14.313 guys just got fined a buttload but not jailed, IIRC.

[hga]

And that was after a warning (14.313 is a wonderful search term): http://www.arrl.org/news/fcc-fines-pennsylvania-ham-11-500-f...

Searching on the term linear amplifier, this was the only example of jail time I was able to find, and that after many previous enforcement actions including revoking his license 20 years earlier: http://www.eham.net/articles/1744