By John Simkin To mark Martin Luther King Jr. Day a group of academics, journalists, lawyers, Hollywood artists, activists, researchers and intellectuals, including two of Robert F. Kennedy’s children, are calling for reinvestigation of four assassinations of the 1960s. On the occasion of Martin Luther King Jr. Day, a group of over 60 prominent American citizens is calling upon Congress to reopen the investigations into the assassinations of President John F. Kennedy, Malcolm X, Martin Luther King Jr., and Senator Robert F. Kennedy. Signers of the joint statement include Isaac Newton Farris Jr., nephew of…