There has been a few probelms about PRC going on strike and being unprofessional workers. And also about Filipinos who think very highly about themselves even though they are here because they can't cope with their own country's unemployment rate.
But I think the biggest danger to Singapores social fabric is posed by Indian nationals who come here to work and take up citizenship. They come here and tell Singaporeans about how great India is, and tell their friends in India how great it is to be in Singapore. These are people who have no sense of identity, so they would just affiliate themselves with whatever seems like a better status symbol at the time.
Many of them have an agenda to replace Tamil with Hindi as an official language. Their argument for this is that since Hindi is the official language of India (which is not even true), it should be the main language of all the Indians in Singapore. What they have to learn is that Singapore is not India, and nobody here wants Singapore to be anything like that pot of diarrhea.
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This is not the same Singapore as the British trading post that it used to be, where people brought their own different cultures here. We have come a long way, with a lot of cultural diffusion and created something that is different than the individuval cultures of our ancestor's homelands.
So if these FTs even dare to think about being one of us, they have to adopt our ways, we will not bother to acomodate their stinking methods. So either join us, or GTFO.