No, there was no TSA on 9/11. Airport security was handled by private companies, most notably the infamous Argenbright which employed illegal & convicted felons.
TSA is not yet unionized. NRLB cleared the way for it to happen. After enough assaults & verbal abuse, the union thugs will swoop in with promises to protect the TSOs. And into their arms the TSOs will run.
TSA screens cargo in our ports working with the CG.
Most of the private security firms working at airports that have opted out of TSA are union.