The six-year-old told police both Berg and Tuinstra had sexually assaulted her and Neumann knew about the abuse, the criminal complaint said.
She also told officers Neumann made her watch others engage in sexual acts, police said.
The abuse allegedly happened at an apartment on Ruggles Street. The woman who called police told officers everyone in the apartment wore dog collars, including the six-year-old.
Berg and Tuinstra initially denied abusing the girl, but later told police they had, the criminal complaint said.
Neumann has denied the allegations.
Berg is charged with first degree sexual assault of a child under age 12. Tuinstra is charged with repeated sexual assault of a child and exposing his genitals.
Neumann is charged with first degree sexual assault of a child under age 12 as a party to a crime, two counts of failure to act against sexual assault of a child and one count of making a child under 13 watch or listen to a sex act.
The suspects' attorneys did not immediately respond to NBC26's request for a comment.
Berg and Tuinstra will be back in court on December 4.