They were arrested after they threatened to hold a three-day agitation in the state (Uttar Pradesh) against the alleged misrule of the BSP government. They were apprehended as a preventive measure so as to avoid any sort of untoward incident that might emerge in the state.
Mulayam Singh expressed his wrath on the issue and wrote a letter to Lok Sabha Speaker Meira Kumar on the issue and said, "I was not allowed to move out of the house to attend Lok Sabha. This is gross violation of law."
Mulayam Singh was also quoted as saying, "The SP agitation against Mayawati in the state has been successful. I have written a letter to Lok Sabha speaker against the Mayawati government."
The Uttar Pradesh Police have made other preventive arrests across the state including many other SP leaders.