Susan Fowler showed just how powerful one voice can be against a big company. Now, she’s fighting to make sure those voices can also work together.

Fowler, whose blog post chronicling her time at Uber eventually led to the ouster of founder Travis Kalanick as CEO, filed an amicus brief last week in a landmark labor law case going before the Supreme Court. An amicus brief is a document filed in a court case by someone who isn’t directly involved, but has a strong interest in the subject or outcome.

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“The effect of these is to make it difficult for employees to protest a wide variety of conditions, some of which may be unlawful,” said Bill Gould, a professor emeritus at Stanford Law School and a former chairman of the National Labor Relations Board.

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Gould, who as a former chair of the National Labor Relations Board has followed this for years, doesn’t have high hopes.

“Based upon the way the Supreme Court has treated these arbitration clauses in the past, my judgment is that they will go against the employees,” he said.