NEW DELHI — Mohan Lal fled his village 13 years ago to escape the insults that were part of life as a Hindu without a caste.

When he returned home earlier this summer, Lal found that his family and other casteless people still were pariahs of the village in Rajasthan state.

Caste Hindus do not allow "outcastes," as they are called, to wear shoes, ride bicycles, use umbrellas, drink from the main village well or hold their heads up while walking in the street.

Dozens of other rules ostracize the 100 million Harijans--untouchables who do not belong to any of the four castes recognized by the Hindu religion. The four Hindu castes determine a person's social position by birth: the Brahmins, or priests; Kshatriyas, or soldiers, governors and landowners; Vaishyas, or tradespeople and farmers, and Shudras, or craftspeople and menial workers. Each caste has many subdivisions.

"We are treated worse than dogs," said Lal, 28, now a construction supervisor in New Delhi.

Harijans have suffered for centuries under the rigid Hindu caste system, and the oppression is compounded by poverty and illiteracy. Most Harijans are agricultural laborers who are lucky to earn enough for two meals a day.

Sociologists and social activists say the subjugation of Harijans in this nation of 880 million is perpetuated by politicians because the untouchables provide useful "vote banks" during elections.

Harijans means "children of God," in Hindi. Mohandas K. Gandhi gave untouchables the name in hope it would provide them some respectability.

The practice of untouchability was declared illegal after independence from Britain in 1947, but it continued unchecked.

Politicians rarely talk about the problems of untouchables. Welfare Minister Ram Vilas Paswan, a Harijan himself, acknowledged in Parliament in May that he did not know how many untouchable victims of violence had been aided by the government.

Paswan said authorities had been "asked to take appropriate action both to punish the perpetrators of crimes and to provide appropriate relief and rehabilitation to the victims."

The government says 14,269 cases of atrocities against Harijans were recorded in 1989, including 759 rapes and 479 murders.

One Harijan laborer was burned to death April 5, allegedly by his upper-caste village landlord. The case was publicized because the victim was a resident of Prime Minister V.P. Singh's constituency of Fatehpur in the northern state of Uttar Pradesh.