Explanation:

- Jyotirao Phule founded the 'Satyashodhak Samaj' in 1873. This organization aimed to promote social equality, particularly focusing on the rights of the oppressed classes and women.

- Mahatma Gandhi was a prominent leader in India's independence movement but did not found the Satyashodhak Samaj.

- Dr. B. R. Ambedkar was a key figure in drafting the Indian constitution and an advocate for the rights of Dalits, but he didn't establish Satyashodhak Samaj.

- Swami Vivekanand was a spiritual leader and key figure in introducing Indian philosophies to the West but wasn't associated with founding Satyashodhak Samaj.