I was a relatively unsophisticated college kid at a BIG New England land grant university at that time. Got exposed to all manner of things that had never before been on my scope -- this new "gay" theme for one. Took me a while to figure out that the word wasn't being used with its old-timey connotations. Stuff like this tricksy FBI thing would have seemed like a pretty funny combination until I got it. Then again, I never heard anyone say that socialists couldn't be a festive bunch.
Some part of me still wishes "the gays" had appropriated another descriptive term. It was a great word...and they just TOOK it!! Damn them all.
That said, I'll bet the FBI is still confused.