Bharatiya Kisan Union (Lok Shakti) chief Sheoraj Singh on Wednesday wrote a letter in blood to Prime Minister Narendra Modi, demanding the repeal of the three new farm laws that have stoked massive protests by farmers' unions in north India. The letter by Singh, who is camping at the Dalit Prerna Sthal in Noida along with his faction members since December 2, came as protestors marked the birth anniversary of former prime minister and farmers' leader Chaudhary Charan Singh. "Take back the agriculture bill, make law to ensure guarantee on minimum support price (MSP) and form a kisaan aayog (farmers commission)," he wrote in the brief letter addressed to PM Modi.