Alberto claims European clubs are stripping Brazil of talent.
United have recently agreed a deal to sign 17-year-old defender Dodo from Corinthians.
Alberto told News of the World: “It is disgraceful United are allowed to rape Brazilian football.
“The big teams have the money and can take our best players. It is a big problem in Brazil. The clubs cannot keep hold of them if they are good young players because they can make much more money in other countries.
“They should change the law so at least until the age of 20 or 21 the best players are playing in Brazil and get some experience before moving to Europe.”
He added: “FIFA must do something. They have an obligation to save football. If we could have conditions where we could keep these players in Brazil it would be much better for us.
“Three or four years ago clubs had to pay teams if they wanted players but now many players are owned by agents – and clubs can’t afford to keep them.”