Ignoring Congress appears to be lower on the FCC's enforcement scale than naughty words and breasts.
From recent ARRL reports, BPL interference has brought little or no enforcement action from the FCC, despite the agency's congressional mandate per the Communications Act of 1934.
An extremely troubling aspect of today's FCC is how powerful it imagines itself to be – and by extension other executive agencies – in relation to Congress and the courts. Congress regularly passes laws that need interpretation by an expert agency. And courts routinely defer to the agency when it claims to offer interpretation of the law beyond the court's "expertise".
The Supreme Court is set to hear a tiny internet service provider's case against an FCC behaving badly; the outcome will have a profound effect on your internet future.
http://www.alternet.org/mediaculture/21598/