The elite American gymnast Simone Biles has previously testified in the Senate about abuse she suffered at the hands of disgraced former team doctor Larry Nassar.
The Former Teammates Aly Raisman and McKayla Maroney also appeared before the committee, along with FBI Director Christopher Wray.
Committee examines flaws in FBI investigation Nassar, later convicted of abuse sex on girls.
He is serving a life sentence.
"I blame Larry Nasser, and I blamealso an entire system that activated and carried out its abuse "said Ms. Biles, the most decorated Olympic gymnast of all time.
" If you allow a predator to harm children , the consequences will be quick and serious ", she added.
Gymnast Maggie Nichols - the first victim to report her abuse to USA Gymnastics - also testified .
They are among more than 200 women who made hard-hitting impact statements in court in 2018, detailing Nassar's abuse while he was the team's sports doctor national femaleine gymnastics of the United States.
A long-awaited report in the FBI investigation , which was released in July, revealed numerous missteps and cover-ups by FBI agents, which allowed the abuses to Nassar to continue for months after the case was opened.
The Justice Department's Inspector General's 119-page report found that despite the seriousness of the allegations against Nassar, the FBI's field office in Indianapolis had been slow to respond.
Faced with their mistakes, two FBI officials lied during interviews to cover up their mistakes, according to the report. Last week, one of those officials was fired by the FBI, US media reported.
image source, Reuters image caption Olympic gymnasts Simone Biles, McKayla Maroney, Aly Raisman and Maggie Nichols
On Wednesday, Ms. Raisman criticized the FL 'BI investigation was "like guesswork ", while Ms. Maroney - who was the only one victim initially interviewed by the agency - described her experience as profoundlydisappointing.
"They chose to fabricate, lie about what I said and protect a serial child molester," Ms. Maroney told the committee. "What is the point of reporting abuse if our own FBI agents take it upon themselves to bury this report in a drawer?
President Dick Durbin said the Judicial Committee hearing of the Wednesday's Senate would examine what led to the failure of the FBI investigation to "prevent similar future tragedies ".
Mr. Wray is expected to face pointed questions about the malfunctions and why the agents violated FBI policy were never prosecuted for their misconduct.
In all, Nassar was charged of sexual abuse by more than 330 women and girls at USA Gymnastics and Michigan State University.
Olympic Gold medalist Simone Biles is the most publicized victim to speak out about her abuse. After breaking her silence, Ms Biles said that shewas "relieved " after speaking out, after feeling "a lot of pressure " to keep the truth to herself for so long.
McKayla Maroney, who won gold at the London 2012 Olympics, said she was sexually assaulted by Nassar over a
"It appeared whenever and everywhere this man could find the opportunity, I was 'treated ' ", she wrote on Twitter in 2017.
media caption Simone Biles explains in 2018 why sharing the abuse story will encourage others to come forward