From Wikipedia, where I was doing some background research on various football teams:
In 1930, there were still many who questioned the quality of the professional game, claiming the college "amateurs" played with more intensity than professionals. In December 1930, the Giants played a team of Notre Dame All Stars at the Polo Grounds to raise money for the unemployed of New York City. It was also an opportunity to establish the skill and prestige of the pro game. Knute Rockne reassembled his Four Horsemen along with the stars of his 1924 Championship squad and told them to score early, then defend. Rockne, like much of the public, thought little of pro football and expected an easy win. But from the beginning it was a one-way contest, with Friedman running for two Giant touchdowns and Hap Moran passing for another. Notre Dame failed to score. When it was all over, Coach Rockne told his team, "That was the greatest football machine I ever saw. I am glad none of you got hurt." The game raised $100,000 for the homeless, and is often credited with establishing the legitimacy of the professional game for those who were critical.
The two things I find intriguing are: 1. There was a time that pro football was considered lower quality and intensity than college. 2. They raised $100,000 for the homeless during the Depression - essentially $1.4mm in today's dollars.
Not an insubstantial sum, it represented .6% of per capita government welfare spending in the New York area. Total government (federal, state, and local) spending in 1930 was $11.9bb and only $300mm was on welfare. By 1934, those totals were $12.8bb and $1.0bb. By 1940, the same figures were $20.4bb and $2.1bb.
For all the problems the NFL faces, there is still plenty to feel good about, though I don't think it would be easy to match that $1.4mm figure today, unless all the ticket receipts were just turned over.
