Prime Minister Narendra Modi on Wednesday launched a strong attack on the ruling DMK-led alliance in Tamil Nadu and said he will continue to expose the "decades-old dangerous politics" of the ruling party in the state. Addressing a rally in Vellore, PM Modi alleged that DMK makes people fight in the name of region, religion and caste and the regional party knows that the day people understand the politics of divide and rule, the party will not get a single vote. He also attacked the DMK over drug smuggling in the state.