I thought this may have been of interest to some people here. The FBI has recently released files on him. He was involved in a division known as the "Center for Study of Social Policy". Very interesting read:
http://www.thememoryhole.org/hubbard/hubbard_al_fbi_file.pdf
http://www.thememoryhole.org/hubbard/hubbard_al_fbi_file.pdf