have reason to believe/for believing

have adequate evidence or justificationfor believing

The National Writers Union has reason to believe that KeepMedia
may be infringing on the works of freelance writers.  Google

Suppose that the government has reason to believe that a large company discriminates against women.  Google

The Department of Justice may start a lawsuit where it has reason to believe
that a creditor is engaged in a "pattern or practice" of discrimination. Google

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