Hollywood actor Leonardo DiCaprio has been slammed by the Indonesian government over his visit to the Gunung Leuser National Park in northern Sumatra, where he met with environmental activists and urged the public on social media to stand up against palm oil.'A world-class biodiversity hotspot, the Indonesian Leuser Ecosystem is one of the most important areas of intact rainforest left in Southeast Asia. Its forests are home to the densest remaining populations of the critically endangered Sumatran orangutan. But palm oil expansion is destroying this unique place," DiCaprio posted on Instragram, alongside photographs with orangutans and local environmentalists.After being alerted to the publicity around palm oil that DiCaprio was generating, immigration authorities on Thursday threatened to deport him on the charges that his visa to Indonesia only permitted him to do tourist activities, reports Efe."If he is in Indonesia for other purposes, such as creating a public disturbance and harming the state39s interests, immigration is ready to deport him," Ronny F. Sompi, director general of Immigration department said, as cited by a local newspaper.Indonesia is the world39s largest producer of palm oil, which contributes to around half of the Southeast Asian nation39s annual GDP and has led to the destruction of at least nine million hectares of indigenous rainforest, according to the environmental non-profit Rainforest Rescue.