3 years is the "general" statute of limitation on most class actions such as intentional tort, quasi-contract, and the likes.
However, there are exceptions to that and they vary widely and extend as long as 10 years as in the following example:
"....suing under the Alien Tort Claims Act (ATCA), which has a statute of limitations of ten years and concerns torts relating to personal injury, not property."
The statute of limitations for class actions suits is the same as it is for whatever area the lawsuit is in-personal injury, medical malpractice, etc-and the statutes for the different types of lawsuits vary from state to state. The same goes with libel.
(In the USA) there is none.
There is no statute of limitations on homicide (capital murder) in the USA.
Highway Patrol - 1955 Statute of Limitations 2-18 was released on: USA: 4 February 1957
Touched by an Angel - 1994 Statute of Limitations 2-24 was released on: USA: 18 May 1996
The Philco Television Playhouse - 1948 Statute of Limitations 6-11 was released on: USA: 21 February 1954
Monster Buster Club - 2008 Statue of Limitations 1-15 was released on: USA: 8 September 2008
Press Start Adventures - 2006 Statue of Limitations 1-8 was released on: USA: 29 December 2006
Dateline NBC - 1992 Class Action was released on: USA: 3 November 1999
Where I Live - 1993 Class Action 2-6 was released on: USA: 1993
The Temp Life - 2006 No Class Action 4-13 was released on: USA: 22 February 2010
Depends on which USA state where you live - Check Debt with Statute of Limitations; and http://www.bcsalliance.com/y_debt_sol.html
Flipping Vegas - 2011 Class Action House 2-7 was released on: USA: 2 February 2013