Di Canio must come clean.
The Italian and ex-Swindon boss (right) is the replacement for sacked Sunderland manager s Martin O'Neill and took training yesterday.
The former Lazio, Sheffield Wednesday and West Ham striker has previously admitted to having fascist leanings, telling Italian news agency ANSA in 2005: "I am a fascist, not a racist."
Former foreign secretary David Miliband immediately resigned as Sunderland's vicechairman and non-executive director, citing the Italian's "past political statements".
Powar is concerned the appointment of Di Canio could have dangerous repercussions if his political beliefs are not immediately challenged.
"When there is a rise of intolerance and there is a coach in the most watched league globally, who hasn't clarified or wanted to renounce his fascist views, it is a worrying time," he said.