You're referring to the speech at the beginning of the song "The Camera Eye", which contrasts the different atmospheres you notice while walking down the streets of Manhattan and London. It's the opening song on side two (remember the album was made when we still used record players).

The speech is supposed to simply be voices amid the hustle and bustle of the city streets. It doesn't, as far as I know, contain any hidden messages. It's deliberately mixed so that you can't tell what's being said.

The next song on the album, "Witch Hunt" has a similar set of voices, this time supposedly sounding like an angry mob coming to burn a witch. It wouldn't surprise me if the voices on Camera Eye and Witch Hunt were pulled from the same recording session. Here is a description of the Witch Hunt session, taken from two separate interviews with members of the band:

From "Visions": "It is purposely mixed so that you cannot understand what is being said, but the tenor of the situation, the hatred, the ill will, and the fear comes through loud and clear. This effect was created by emptying the studio (in the middle of a snowy night) of production staff, road crew and band, and depositing everyone in the cold outside the isolated facility. With tape recorders rolling, Neil gave his best fanatic's speech, gradually getting more and more whipped up as everyone involved let themselves get carried away."

Alex Lifeson ("In The Studio" for Moving Pictures): "We went outside of Le Studio and it was so cold, it was really cold; we were well into December by then, I think. We were all out there. We put a couple of mics outside. We started ... rauw, raew, wrow ... (starts mumbling), ranting and raving. We did a couple of tracks of that. I think we had a bottle of Scotch or something with us to keep us warm. So as the contents of the bottle became less and less, the ranting and raving took on a different flavor and you got little lines of ... you remember Roger Ramjet, the cartoon Roger Ramjet? What was the bad guy's name ... his gang of hoods, they always had these little things they would say whenever they were mumbling ... mrrblaarrr ... mrrblaarrr ... crauss. It started to take all this ... we were in the control room after we had layed down about twelve tracks of mob - in hysterics. Every once in awhile you'd hear somebody say something really stupid."