"People from weaker section of the society were not even allowed to enter a few polling stations," Ramzan Chaudhary, an Aam Aadmi Party volunteer from Mewat, told IANS.
Poor voters from Ghasera village, also called Gandhigram Ghasera as Mahatma Gandhi visited it in 1947, were barred by a mob from voting, he said.
Similarly, people from Ranyaki village, home to nearly 1,000 voters, were told by upper castes not to approach the polling station.
"Many people who were barred from voting complained to policemen but they seemed helpless," Chaudhary said.
He said complaints have been lodged with senior officials.
Ferozpur Jhirka, Punhana and Nuh assembly segments of the Gurgaon Lok Sabha seat fall in Mewat district.
Besides Yogendra Yadav, the other leading candidates in Gurgaon are Zakir Hussain (INLD), Rao Dharampal (Congress) and Rao Inderjeet Singh (BJP).