The Supreme Court has slammed the political parties of Punjab for playing death row politics on the hanging of Babbar Khalsa terrorist Balwant Singh Rajoana, who was sentenced to death for the assassination of then Punjab chief minister Beant Singh in 1995. The Centre had, yesterday, stayed Rajoana's hanging, following a mercy petition filed by Sikh body, Shiromani Gurdwara Parbandhak Committee (SGPC), that has been actively backed by the Punjab government and other political parties in the state.