Jan Parkinson from the Employment Relations Institute has told Daybreak that there can be different forms of bullying in the work place.
She said: "Bullying can be around your gender, race, religion or making fun of somebody."
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Michael Danaher, 50, killed historian and book dealer Adrian Greenwood at his home over a £50,000 first edition copy of Wind In The Willows.
The former Cardiff South and Penarth parliamentary candidate joins Suzanne Evans, Paul Nuttall and Raheem Kassam in the race.
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