(CNN)Athletes at the Tokyo Olympics this summer have been told that they better not protest on the field, on the medal stand or in the Olympic Village, according to new guidelines.
International Olympic Committee tells athletes they cannot take a knee in protest but they can make comments on social media
Prohibited acts of protest include "gestures of a political nature, like a hand gesture or kneeling," the recently distributed Rule 50 Guidelines say.
Athletes will be allowed to express their opinions on digital or traditional media, or on other platforms. They can also do it when being interviewed at news conferences or in an area called the mixed zone, according to the International Olympic Committee.
US hammer thrower Gwen Berry has hit out against the new guidelines, expressing concerns over what she calls "a form of control" and "silencing."
In August 2019 as the US national anthem was played at the Pan American Games in Peru, Berry raised her fist after she won gold.
Speaking to Yahoo Sports, Berry said: "We sacrifice for something for four years, and we're at our highest moment.
"We should be able to say whatever we want to say, do whatever we have to do -- for our brand, our culture, the people who support us, the countries that support us, [everything].
"We shouldn't be silenced. It definitely is a form of control."