Show us where the Senate "democrats" had been notified of the report.
Jackson was the junior Democrat on the McCarthy subcommittee. He was delegated by the minority to be briefed by the FBI on behalf of subcommittee Democrats. Either he shared this information with McClellan and Symington, or he withheld it. Neither option makes Jackson look very good. But for anyone familiar with the Senate, your implication that Jackson withheld this information from fellow Democrats on the subcommittee strains credibility. Yet if true, it makes Jackson look even worse.
Show us where Jackson "knew better."
Jackson was informed by the FBI that the Communist Party of Washington, DC had listed Annie Lee Moss not just as a member, and subscriber to the
Daily Worker, but as a Group Captain for registration. He was also informed that her address was "72 R Street," the same address Moss later testified was her own.
Jackson himself declared the information he obtained from the FBI to be convincing. Later, when Moss slipped up and confirmed the address the FBI had given Jackson, there could be no doubt.
It was on the basis of the exact same FBI evidence Jackson had -- and no other -- that the Subversive Activities Control Board found publicly in 1958 that Annie Lee Moss was a Communist Party member.
If you are still able to find reasonable doubt, you are of course entitled to your opinion. Historians who have examined recently available evidence, however, have generally come to the opposite opinion. See, for example, Arthur Herman,
Joseph McCarthy: Reexamining the Life and Legacy of America's Most Hated Senator, or Andrea Freeman,
The Strange Career of Annie Lee Moss: Rethinking Race, Gender, and McCarthyism.