WASHINGTON — Kenneth T. Scott opposes abortion, and he says so in public. Sometimes he holds up large pictures of aborted fetuses. Sometimes he makes his points near churches that he believes are not doing enough to combat abortion.

A couple of years ago, the Supreme Court ruled that hateful antigay protests at military funerals deserved First Amendment protection. It will soon decide whether to hear a sequel, this one involving Mr. Scott.

On Palm Sunday in 2005, he and other protesters turned up near an Episcopal church in Denver. As the parishioners re-enacted Jesus’ entry into Jerusalem in an outdoor ceremony, Mr. Scott stood on a parked car on public property and addressed the procession from about 20 feet away.

Some observers said he was loud. Others said he was screaming. He showed large pictures of aborted fetuses. About 200 children were present, and some of them became upset.