Police said the security officer Subhas Rakshit had to be taken away after some people verbally abused him.
The plant had retrenched some security personnel during its downsizing as it reopened in May after suspension of work in April 12.
Rakshit himself did not lodge any formal complaint and did not say anything to the press.
Uttarpara police station O C Arijit Dasgupta said a force went to the spot and pacified the people that had gathered. Rakshit was taken to another place.
The retrenched workers were stated to have had grievances against those having resumed services and any newcomer.
