Anna had come to Patanjali Yogpeeth Ashram in Haridwar in a bid to woo Ramdev's support.
Hazare said, "The Centre must worry as we are now joining hands." He also said, "I am alive because I have a clean image. Otherwise, I would have been killed."
"We will now launch our campaign against corruption on a joint platform with Baba Ramdev," he said.
"From today, we have sounded a bugle against corruption and black money. We are now together," Anna said.
"We will hold a one-day hunger strike at Jantar Mantar on Mar 25," warning the Centre, the yoga guru added that the agitation against corruption would intensify in Apr-May.