Scarlett Johansson has severed her ties with a humanitarian group after being criticized over her support for an Israeli company that operates a factory in the West Bank settlement "of Maale Adumim - to the detriment of Palestinian rights," The Christian Science Monitor reported.

The 29-year-old Jewish actress has been called naïve and irresponsible for endorsing SodaStream, a device that turns water into a carbonated product, in a Superbowl ad. The endorsement forced Johansson to step down Thursday as a global ambassador for the humanitarian agency Oxfam International, The Christian Science Monitor reported.

Johansson's spokesman released a statement Wednesday saying the starlet had a difference of opinion with the humanitarian group because it opposes all trades with Israeli settlements. Oxfam reportedly believed Israeli settlements are illegal and deny Palestinian rights.

"Scarlett Johansson has respectfully decided to end her ambassador role with Oxfam after eight years," the statement said, according to People. "She and Oxfam have a fundamental difference of opinion in regards to the boycott, divestment and sanctions movement. She is very proud of her accomplishments and fundraising efforts during her tenure with Oxfam."

Johansson's endorsement of SodaStream propelled an international campaign to boycott the sodamaker.

However, Palestinians who are most familiar with the factory, because they work there, are siding with Johansson.

"Before boycotting, they should think of the workers who are going to suffer," a Palestinian employee for SodaStream told The Christian Science Monitor.

The worker said he made $6 a day plucking and cleaning chickens; now he makes nearly 10 times that amount at SodaStream.

The sodamaker company has come under fire from pro-Palestinian activists for maintaining a large factory in the West Bank settlement, territory captured by Israel in 1967 and claimed by the Palestinians.

Johansson had served as global ambassador for Oxfam International since 2007. She was tasked with raising funds and promoting awareness about global poverty, People reported.