Yadav was participating in a debate in the Rajya Sabha on rumours triggering panic over ethnic violence in Assam that is leading to a mass exodus of people from the North East from Bangalore.
"TANGO DOWN: http://www.samajwadiparty.in ..." @opindia_revenge tweeted. Access to the www.samajwadiparty.in website intermittent at the time of posting this report.
The hackers collective is known to target websites in retaliation. In the past Anonymous India has attacked Congress, Supreme Court, MTNL websites and also claimed to have hacked into Reliance Communications' servers.