The CBI conducted raids at the residence of Stalin in connection with a case involving illegal import of foreign cars worth Rs 20 crore.
Media reports said that the CBI conducted raids after Directorate of Revenue Intelligence (DRI) complaint regarding case involving alleged illegal import of foreign cars.
One of the illegally imported cars is allegedly being used by Stalin's son, reports said.
DMK said the raids a "political vendetta".
"One can understand how the Congress government is working, how are they behaving. This is only political vendetta. Let the CBI do anything, we don't bother. One has to understand how the Congress has stooped down to this level," said DMK MP TR Baalu.
DMK had pulled out of the ruling UPA coalition at the Centre over the government's refusal to take a strong stand against Sri Lanka over killing of Tamils at the UN's top human rights body in Geneva.
After DMK's pull-out from the government, UPA leaders maintained a brave face.
"The government has a majority in the House," finance minister P. Chidambaram said.
"The UPA is not a lame-duck government, we are stable. The test is on the floor of the House. No political party has challenged the majority of this government. We will continue with the policy decisions we have been taking and we will have to take," parliamentary affairs minister Kamal Nath added.