A federal statute prohibits the broadcasting of lottery advertisements, except by stations that broadcast in states permitting lotteries. The purpose of the statute is to support efforts of states that outlaw lotteries. Truth Broadcasting operates a radio station in State A (a nonlottery state) but broadcasts primarily in State B (a lottery state). Truth wants to advertise State A’s lottery but is barred by the statute.

This case involves a particular kind of speech. What kind? What is the rule about that kind of speech?