I think the big difference is that to tell of the Mafia in the 1950's would have been a way bigger offense. No one knew of the families and structures, but by the 1970's there were many news reports on it. Different eras and circumstances.
Before Valachi in 1963 nobody apart LCN and after the mob remained secret but after the dead of Hoover (that always said that the mob dont exist) the FBI declared war and in 1980s the secret society wasnt secret anymore.
