@Bonaventurian,
The perpetrators of the actual crimes of rape and murder were prosecuted. ACLU did not defend, nor attempt to defend the perpetrators (unless their lawyers came from the ACLU's ranks - I dunno).
The perpetrators, whilst they had in their possession NAMBLA material, where not the entirity of NAMBLA, and had nothing to do with the ACLU.
When the parents of the boy who the perpetrators killed and raped tried to have members of NAMBLA convicted of murder as well the ACLU stepped in. They pointed out that, whilst they do not approve of NAMBLAs attempt to have the age of consent revoked NAMBLA were not guilty of murder for two reasons:
1) NAMBLA do not condone violent sexual acts, murder or sex without consent. You know, the actual crimes perperated by the criminals.
2) Even if they did, a person who states that a crime should be legal is not guilty just because the crime was committed. Guilt by association in this way is not regarded under US law - so US legal advice should be provided to those who are accused of it.
So the bad guys - the people who actually did the raping and murdering - were tried and neither NAMBLA nor the ACLU tried to obstruct their sentencing.
The guys of NAMBLA - unwholesome as they are - were not guilty of a crime, and despite the fact that the ACLU did not respect their views they sought to protect freedom of speech.
You may well wish for the expression of ideas you and I both find appalling to be illegal, but I don't agree. I think it's throwing the baby out with the bathwater to cede hard-won rights just because this does not happen to be a dainty world.