How do I find out if there is a class action suit against the plasma IVIG ? I do not know who is the manufacturer.

Why do you think you have a suit?

There are 7 or 8 manufacturers, who make it under different brands, so you will need to know exactly who made yours, and also understand there are listed and known side effects a person should have been aware of.

This site lists some of the information.
http://www.myositis.org/storage/documents/2012_AC_Presentations/tma_2012-greer._ppt.pdf

There has been a very law suits for many issues.

One class action law suit was from the hospitals to the suppliers for price fixing.

Another class action law suit from 2000 was about infections, and side effects from the patients,

If you have an issue, you first need to arrange an attorney who will find if there is any current cases open. I could not find any current cases.