The Directorate of Enforcement (ED) raided 10 premises, including the residences of former Kerala chief minister Pinarayi Vijayan, in connection with its probe into alleged fraudulent transactions.
The searches began simultaneously at multiple locations in cities such as Kozhikode, Kochi, and Thiruvananthapuram.
Top CPI(M) leaders and hundreds of party workers protested outside the homes of Vijayan, against what they termed as a "political vendetta" by the BJP-led Union government.
Angry CPI(M) workers attacked the cars of ED officials, smashing windshields and windows, but no one was hurt.
The agency found proof of investments and bank FD details of Vijayan's daughter, Veena T, and froze ₹18.36 crore in 242 accounts.
The raids came a day after the Kerala High Court gave the go-ahead to ED to continue its probe into alleged bribery and money laundering acts.
