David Conn: Onus on clubs to prevent ugly spectre of racism rearing its head again

If you had invited predictions a year ago about football's most combustible issue, it is unlikely that racism, the focus of sustained and successful efforts to kick it out, would have come anywhere near top of the list. Yet as Liverpool prepare to face Manchester United in the FA Cup for a match in danger of being more poisonous than for a long time, football's long, progressive battle against racism is suddenly spotlit again.