The company's deal with the government has brought 'cries/accusations of foul play' [=claims that there have been unfair or dishonest acts] from its competitors.
She is still missing, and the police now suspect that she may have been a victim of 'foul play'. [=that she may have been murdered or harmed in some way]
After leaving school she 'fell foul of' the law. [=she got into trouble with the law; she was arrested for committing a crime]
(..) - Not so far. Frank Hackett just walked in. We had to abort the show. So far over fucking phone calls... complaining about the foul language. - What page are you putting it on? - Hackett just walked in. - ABC again. - Tell 'em to go fuck themselves. That goes for you, too, Marty. (..)1976 Network