The incident occurred in Aklera area where the activists were holding a street play as part of their campaign.
"The activists have lodged a complaint against unidentified persons, and we have arrested four accused in this connection," SP Jhalawar Rajendra Singh said.
Windowpanes of some of the vehicles of the activists present there, were smashed by the crowd, the victims alleged.
The 'yatra', that will cover all the districts of the state, started on December 1 last year from Jaipur, organised under the aegis of Soochana Evam Rozgar Adhikar Abhiyan.
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Roy, who was not present at the site of the incident, however, in a statement has alleged that the members of the 'yatra' were attacked by men, armed with lathis, who broke their cameras and damaged windowpanes of their (activists) vehicles.
She alleged that the attackers were led by BJP MLA Kanwar Meena.
The BJP legislator, who represents Manohar Thana constituency of Jhalawar district in the Assembly, could not be immediately reached out for comments.
Jhalawar is the Lok Sabha constituency of Dushyant singh, son of Chief Minister Vasundhara Raje.