The protest was led by Thanthai Periyar Dravida Kazhakam (TPDK) general secretary, K Ramakrishnan.
The activists shouted slogans against the Centre and NEET, saying it was not necessary as the state government was carrying out the selection process for medical seats without any irregularities.
As some of the workers attempted to jump over the barriers erected by police, they were arrested and taken into a van, police said.
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