Senior party leader Sanjay Singh also announced Suman Lal, noted RTI activist from Bihar joining the party along with Amanullah.
"I have always given more importance to Swaraj and people's participation and I have tried to implement it in my department and my constituency, which AAP also practices. I contacted the AAP and expressed my desire to join the party and they accepted my proposal," Amanullah said.
Amanullah, who quit as Social Welfare Minister in the Bihar government on Tuesday, however, avoided direct criticism of Nitish Kumar, but criticised the government.
Attacking the Bihar government, she said that there were "flaws even in normal governance".
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"Schools, hospitals and anganwadis don't function normally. Why can't villages have same levels of hygiene like cities as even they require a system...It is important to have solid waste management, same hygiene levels in villages as it is in the cities", she said.
When asked whether she left the party owing to differences with the Chief Minister or whether she agreed with a section of leaders in JDU who allege that Nitish Kumar was acting like a dictator, she said, "In most states, Chief Ministers hold complete power and same is the case in Bihar".
"There have been achievements, but we could have done a lot more. We could have imbibed more of people's participation and accountability.