Question: What group of workers has paid $100 Billion into social security over the last ten years — the same group that pays around $13 Billion a year into social security but will get only about $1 Billion back later in life? That’s a large loss to them and gain to the social security fund.
Answer: People who live and work here illegally.
Read about it at https://news.vice.com/article/unauthorized-immigrants-paid-100-billion-into-social-security-over-last-decade.