Former Rangers chief executive Charles Green was accused of breaching two rules by the Scottish Football Association after alleged comments he made about ex-Ibrox commercial director Imran Ahmad.
Green - who resigned from his position at Rangers last month - has 30 days to pay the £2,500 fine.
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Known as 'spice' and 'black mamba', the so-called legal high is suspected of contributing to deaths in male and female institutions.