Akhilesh was in the district to inaugurate a sugar crushing unit in Mohaddinpur.
The police said over 500 RLD workers holding demonstration were detained.
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RLD leader Satyaveer Tyagi also alleged the many party workers were injured after cops resorted to cane-charge, an allegation denied by police.
Party's state chief Munna Singh Chauhan said mill owners owe around Rs 2,400 crore to sugarcane farmers but the government was not concerned over the matter.