Bhopal, July 31 (ANI): The Congress party on Thursday staged a protest over the Vyapam scam in Madhya Pradesh and demanded CBI probe. The anguished protesters took to streets and raised slogans against Madhya Pradesh Chief Minister Shivraj Singh Chouhan and a RSS member Suresh Soni, for their alleged role in employment scam. The protesters also burnt a book by the BJP, titled 'Vyapam ka sach' (truth of employment scam). The state unit president of Congress party in Bhopal city, P.C Sharma, said the book was a big lie. Meanwhile, a protesting worker of Congress party expressed his disappointment over the Special Task Force's (STF) investigation in the matter.