The number of racist displays by Russian football fans has doubled in the country which will host the World Cup in 2018, with most cases going unpunished, anti-discrimination campaigners say.

Researchers from the Moscow-based SOVA Center and the UEFA-affiliated FARE Network logged 92 incidents of discriminatory displays and chants by Russian fans in and around stadiums in the 2014-15 season, against a total of 83 for the previous two seasons put together.At the World Cup, "there will be incidents inside stadiums, around stadiums. The question will be how frequently they occur, how serious they are," FARE executive director Piara Powar tells The Associated Press.

Black people were increasingly targeted by Russian fans last season. The report identified 10 cases of abuse of black people or players, compared to five in the previous two seasons. In July, Zenit St. Petersburg striker Hulk, who is black, said he faced racist abuse in "almost every game" in Russia.

However, just one incident of racist or far-right football violence was reported against 21 in the two previous seasons. Researchers linked the sharp fall to better police monitoring of hooligan groups, and an exodus of far-right fans volunteering to fight in the Ukraine conflict.

While Russian soccer authorities are increasingly punishing clubs for racist displays by their fans, many cases went unpunished, and sometimes resulted in black players being disciplined for responding to abuse with rude gestures.

"Racism in football is a general problem and FIFA is fighting this all around the world," Sports Minister Vitaly Mutko said in September. "Russia is a FIFA member and we are also fighting this occurrence."

FARE also accused Russian fan leader Alexander Shprygin of displaying racist and Nazi symbols, and said he should be removed from a government commission overseeing Moscow's preparations for the World Cup.

Shprygin heads the state-backed All-Russian Supporters' Union, known as the VOB in Russian, which works with government bodies as a combination of a pressure group for fans' rights and the major support group for the Russia national team.

FARE, which helps to prosecute racism cases for UEFA, said Shprygin has been repeatedly photographed with symbols and gestures showing support for far-right and neo-Nazi causes. He "has no place in any organization that is contributing to putting the World Cup on," Powar says.

However, Shprygin says such pictures were old photos intended to show how Russian football has changed from the days when the display of far-right symbols was more common. While one picture featuring a white power banner comes with a note saying it was taken in 1996 and that "today they would probably take points off the team," others are posted with no such context, including one picture featuring a death's head symbol similar to that used by the Nazi SS.

"The All-Russian Fans' Union as an organization has an absolutely negative attitude to racism as a negative occurrence, completely condemns it, and doesn't support it in any way," he says. "But at the same time, we would like to make it known that specifically in the Russian Federation, racism as an occurrence is overplayed."The report from FARE and SOVA details discriminatory incidents last season in eight of the 11 host cities for the World Cup. In addition, there were cases in seven more towns and cities which will host training bases for teams during the tournament.

The report also raises concerns that Russian fans with far-right links have gone to fight on both sides in the Ukraine conflict, something that co-author Nataliya Yudina, a Moscow-based researcher with the SOVA Center, considers dangerous.

Yudina argues that Russia may succeed in hosting a safe World Cup for foreign fans and players simply by swamping the event with police, but failing to change attitudes in society, saying: "I worry that the World Cup itself could pass calmly, but that after it there may be incidents."

The report does not include incidents this season, including a case in July when Ghanaian player Emmanuel Frimpong was banned for two games by the Russian Football Union after he gestured with a finger in response to apparent racist abuse.

In another case in August, CSKA Moscow fans abused supporters from Russia's North Caucasus region throughout a league game, prompting the Anzhi Makhachkala club to call for a crackdown on "bigotry."