Dr. B.R. Ambedkar, also known as Babasaheb Ambedkar, was an Indian jurist, economist, and social reformer. He referred to various issues related to the social and economic rights of marginalized communities in India. Some of the key issues he addressed include:

1. Caste System: Dr. Ambedkar strongly criticized the caste system in India, which divides society into hierarchical groups based on birth. He advocated for the eradication of caste-based discrimination and the promotion of equality.

2. Untouchability: He fought against the practice of untouchability, which refers to the social exclusion and discrimination faced by Dalits (formerly known as "untouchables") in India. Dr. Ambedkar worked towards their social upliftment and fought for their rights.

3. Reservation: Dr. Ambedkar is known for his role in drafting the Indian Constitution, which includes provisions for reservation or affirmative action for socially and educationally disadvantaged groups. He believed that reservation was necessary to address historical injustices and create opportunities for marginalized communities.

4. Women's Rights: Dr. Ambedkar was a strong advocate for gender equality and women's rights. He worked towards improving women's social status, education, and rights in society. He also played a significant role in the enactment of the Hindu Code Bill, which aimed to address gender inequalities within the Hindu personal laws.

5. Education: Dr. Ambedkar emphasized the importance of education in empowering marginalized communities. He believed that education was crucial for social and economic development and worked towards establishing educational institutions that catered to the needs of Dalits and other marginalized groups.

Overall, Dr. Ambedkar's work centered around social justice, equality, and the upliftment of marginalized communities in India. His ideas and efforts continue to inspire social and political movements for the rights of oppressed groups in the country.