Thiruvanthapuram, April 2: A sting operation by a leading Kerala-based TV channel claims to have exposed an “unholy alliance” between the Revenue Department officials and real estate brokers with the active support of ruling CPI’s Wayad district unit. The Communist Party of India (CPI) is the second largest ally of the ruling Left Democratic Front (LDF) government. On hearing the news, party’s state secretary Kam Rajendran, who has been quite vocal about the alleged corruption of previous Oommen Chandy government and projecting the CPI’s tough stand on corruption, said he would ask for a detailed probe into this.