When Mack did convince women to join the group, she allegedly lead ceremonies during which the women were branded with a symbol that, "unbeknownst to them", included Raniere's initials.
Mack starred in The CW network's "Smallville", a show about the early life of Superman that ended in 2011.
Raniere was captured in Mexico in March.
Mack was arrested on Friday and charged with sex trafficking, sex trafficking conspiracy and forced labour in conspiracy.
A court hearing for Mack's bail is set for Tuesday, April 24, at 2 p.m. ET. She is not allowed to use the Internet or cellular services while staying at the home of her parents.
Federal prosecutors in New York charged Mack with sex trafficking and conspiracy for recruiting women into a programme within Raniere's Albany, New York organisation Nxivm, representing it as a female mentorship group.
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"In the absence of a substantial bond with extensive conditions, the Court would not have sufficient means to ensure that the defendant would not commit additional crimes during any period of release or that she would not otherwise violate bail conditions", Assistant U.S. Attorneys Moira Kim Penza and Tanya Haijar wrote in a letter to the court last week. News. "She will be released on a $5 million bond and will reside in the Central District of California - home detention with electronic monitoring".
"Allison Mack appeared this afternoon in Brooklyn Federal Court before United States Magistrate Judge Viktor Pohorelsky", a spokesperson for the U.S. Attorney's Office for the Eastern District of NY told E! Mack and other DOS masters concealed Raniere's status at the top of the pyramid from new recruits.
The "cult" DOS, which loosely translates to "Master Over the Slave Women", was said to be run by Keith Raniere with Mack claimed to have been the 2IC.
Mack's mother Melinda secured the $5 million bond using Mack's house in upstate Clifton Park, the family's Los Alamitos home and a retirement account, authorities said.
Mack allegedly "required her slaves... to engage in sexual activity with Raniere".
If convicted, Mack could face a minimum of 15 years in prison.