Downtrodden but hopeful migrants from Myanmar crowded the streets for a look at opposition leader Aung San Suu Kyi, who said she will do all she can to reverse decades of economic ruin and make it possible for them to go home.

In the town of Mahachai, home to Thailand’s largest population of Burmese migrants, thousands crowded around her Wednesday and chanted, “Long Live Mother Suu!”

“I had only seen her on TV and in newspapers,” said Saw Hla Tun, who left Myanmar’s Karen state seven years ago and earns a meager wage carrying heavy salt sacks on his back. “I couldn’t hold back my tears when I saw her.”

Khin Than Nu, who works at a Thai canning factory, said she dreams of her home in Myanmar’s Mon state.

“We left our parents in Burma, and all my brothers and sisters work here to support our parents,” she said. Using a Burmese honorific for Ms. Suu Kyi, she added, “I hope Daw Suu will help develop our country, and bring jobs so we can go home.”

Ms. Suu Kyi arrived in Thailand on Tuesday night on a trip that shows just how much life has changed in her homeland. The Nobel Peace Prize winner lived 15 of the last 24 years under house arrest and dared not leave during the intermittent periods of freedom because she feared the then-ruling military junta would not allow her to return. Now an elected Member of Parliament, she will speak this week at the World Economic Forum on East Asia.

She’ll return to Myanmar briefly before heading to Europe for a five-country tour in mid-June. She’ll address the British Parliament, formally accept her 1991 Nobel in Oslo, Norway, and be the guest of honor at a Dublin tribute concert organized by U2’s Bono and others.

In Mahachai, southwest of Bangkok, Ms. Suu Kyi offered encouragement to the exuberant crowd, many of whom held signs that read, “We want to go home.”

“Don’t feel down, or weak. History is always changing,” she said.

“Today, I will make you one promise, I will try my best for you.”

After speaking to the crowd, Ms. Suu Kyi met with migrant workers who told her they are mistreated by employers but don’t know their rights and have no legal means to settle disputes.

Fixing a battered economy is one of the most crucial challenges facing Myanmar as it begins opening up in the wake of 49 years of military governance that ended only last year.

Thailand hosts around 2.5 million impoverished Burmese who have fled here to work low-skilled jobs as domestic servants or in manual labour industries like fisheries and the garment sector.

Andy Hall, a migrant expert and researcher at the Institute for Population and Social Research at Thailand’s Mahidol University, said the Myanmar migrants up to a million of them lacking work permits make up between 5 and 10 percent of the Thai work force, contributing as much as 7 percent of the nation’s GDP.

Many are exploited and paid reduced wages. Some have been trafficked; some have had their passports confiscated by employers. Hall said they were nevertheless “the lifeblood of a lot of the Myanmar economy, sending home money to support families who don’t have enough money to eat.”

“They have no voice, they can never speak up or stand up,” Hall said. “So for Aung San Suu Kyi to visit is like a dream come true, someone who finally may be able to bring attention to their suffering.”

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