Which activist referred to as Mahatma born on 11th April, formed the Satyashodhak Samaj to attain eq

Which activist referred to as Mahatma born on 11th April, formed the Satyashodhak Samaj to attain equal rights for the unprivileged?
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Which activist referred to as Mahatma born on 11th April,formed the Satyashodhak Samaj to attain equal rights for the unprivileged?,