So Alinsky claimed he wasn't a communist.....
BFD
Karl Marx claimed he wasn't a Marxist.
If you look through the FOIA files on FBI.gov, you won't find a published file with Alinsky or the Industrial Areas Foundation in the title. I have no doubt that one exists, just not published. If you go digging through the published files on other subversives of that time frame, you will find Alinsky's name all through them, so, no doubt, J. Edgar had his number.