A decision to this effect was taken at a meeting organised by the Confederation of All India Traders here.
CAIT National Vice-President A M Vikkramaraja said Dec 4 and 5 would be observed as "foreign direct investment protest days as the decision will largely affect traders families".
He said traders wearing black shirts and badges would conduct several agitations and rallies across the state and also stage a rail-roko as part of their protest.
He said they would also lay siege to the residences of parliamentarians in Tamil Nadu who have extended support to the UPA Government's decision.
"Even if a resolution was passed in Parliament on the decision, the traders will further intensify their agitation. Traders will not accept foreign investments at any cost", he said.