There probably are some who collect checks but how many? They must be a nano group of people. As Snopes points out, there is no right to collect SS benefits. And if you read this you'll see that illegals are actually contributing a whopping 7 billion to our fund...and they have no right to collect any benefits. I'm not sure who's been talking in your ear but you've got it wrong, my friend. Like I said, they are helping pay our way when it comes to SS.
snopes.com: No Social Security for Illegal Aliens Petition
Here's the short of it for anyone not interested in opening the link:
"In its 2008 annual report, Social Security officials said undocumented immigrants actually benefit the Social Security trust fund. One reason is that
many of them pay social security taxes but never collect benefits. In previously published reports, Social Security officials have said undocumented immigrants paid about $7 billion into the trust fund in 2005, the latest year for which numbers were available."
Since I know this crowd, I also know that I need to add a disclaimer.

I'm not in favor of illegal immigration, not one bit. It's just that misinformation doesn't help anyone, pro or anti.