The company has called those claims "grossly misleading and inaccurate".
Mr Clarke added that staff had been meeting at the union's Birmingham headquarters yesterday. He said they were proposing to protest outside Reebok Aztec Black
He added the company had created more than 100 jobs in the Birmingham area in recent years.
The jobs at the factory, which employs 500, are being filled by temps. Unite spokesman Joe Clarke said: "They have all been dismissed without any investigation, which is disgraceful.
Strikers in race dispute are sacked Express Reebok Memory Tech Massage Womens
It was claimed a senior shop steward was suspended after he went to complain to management during work time.
2 Sisters and Unite spent 10 days in talks trying to make a deal on letting the suspended staff go back to work.
"We take all allegations of racism very seriously and these claims are unjustified.
The firm immediately suspended striking workers.
Police were called during the strike when the staff held a sit in in the factory canteen in Bevan Way, on the Alpha Business Park.
"This was very much regrettable from the perspective of 2 Sisters. We have procedures in place that must be adhered to."
But 2 Sisters public relations executive Peter King said: "The staff were dismissed for unconstitutional industrial Saucony Boston action.
"The 54 employees were dismissed following disciplinary action and were notified that they would be dismissed.
"The workers are now saying they want to protest outside the supermarkets that are supplied by 2 Sisters."
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