Kang Sheng
In May 1967, a special file was opened to investigate the circumstances of Ma's escape, under the leadership of Kang Sheng, head of the Central Investigation Agency, and Xie Fuzhi, the Minister of Public Security. Many of Ma's friends and family members were subsequently implicated. In 1968, a standing warrant was issued for Ma's arrest for treason, and the charge was not retracted until 1985.