Following allegations that Labour is whitewashing an anti-Semitism problem, the British party adopted rules designed to facilitate the expulsion of members caught using hateful rhetoric against Jews.

The rules, which the Labour Party Conference adopted Tuesday, “finally make it easier to expel antisemites,” the Campaign Against Antisemitism watchdog wrote in a statement about the rules, but they “do not make it easier to prove that an antisemite is actually antisemitic, which has been a major part of the Labour Party’s problem,” the statement said.

The rules, which have been backed by Labour’s resurgent leader, Jeremy Corbyn, and the party’s national executive committee, explicitly tighten the party’s stance toward members who are anti-Semitic or use other forms of hate speech, including racism, Islamophobia, sexism and homophobia.

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One of the new rules says expulsion will occur in the case of the “holding or expression of beliefs and opinions” that involve prejudice.

But the rules do not define what constitutes anti-Semitism. Corbyn has backed a definition adopted earlier this year by the British government. Based on the International Holocaust Remembrance Alliance, it includes examples of demonization of Israel. But it is not immediately clear whether Labour will follow that definition in deciding what constitutes anti-Semitism.

Following the conference, Corbyn said that anti-Semitism was “completely at odds with the beliefs of this party.”

“This is not a nasty party,” he told Channel 4 News. “Nobody should be abused, whoever they are.”

The British Board of Deputies welcomed the new rules, but added in a statement that it will be watching how they are applied.

“Will those who have maliciously questioned the historical record of the Holocaust, those who have engaged in anti-Jewish conspiracy theories or called for Jews to be purged from Labour still be welcome in Labour, or will they be thrown out as they so obviously should be?” the statement read.

The new rules follow the eruption of a new scandal within Labour. At an event held on the fringes of the main party conference in Brighton, Israeli-American author and pro-Palestinian activist Miko Peled (not a member of Labour) said people should be allowed to question whether the Holocaust took place in the name of free speech.

Denying the Holocaust is illegal in the United Kingdom.

Tom Watson, Labour’s deputy leader, vowed the party would investigate the speaker and said he was disgusted the party gave him a platform.

Labour has been under scrutiny in British media and the political establishment since the 2015 election. Corbyn, a hard-left politician, called Hezbollah and Hamas his “friends” at a 2009 event in which he hosted representatives from the terrorist groups in the British Parliament. He has since said he regrets those remarks.

Under Corbyn, Labour’s membership surged thanks to enrollment by activists and voters from the far left, including people who made anti-Semitic statements, often in connection with Israel. Ken Livingstone, a former mayor of London, repeatedly insisted that the Nazis were Zionists, leading to his suspension in April. Corbyn has resisted calls by major British Jewish groups to expel Livingstone, who denied that his statement was anti-Semitic.

The Jewish Leadership Council, an umbrella group, said the decision not to expel Livingstone was “deeply shocking” and “highlights Labour’s disregard for repairing the historic but broken relationship with the Jewish community.”

Livingstone said Tuesday after the conference that people were “completely distorting the scale of [antisemitism]” within the party. “Some people have made offensive comments; it doesn’t mean they’re inherently anti-Semitic and hate Jews,” he said. “They just go over the top when they criticize Israel.”

Len McCluskey, of the Labour party, also appeared to dismiss Labour’s anti-Semitism problem, suggesting it was all part of some plot to undermine Corbyn.

“I believe it was mood music that was created by people who were trying to undermine Jeremy Corbyn,” McCluskey told BBC’s Newsnight on Tuesday, in remarks picked up by the Guardian.

“I’ve never been at a meeting where there was any ant-Semitic language or any attacks on the Jewish nation; they would have had short shrift at any meeting that I was at,” he said.

When asked why such allegations were made if they were not true, McCluskey answered: “Because they wanted to bring Corbyn down, it’s as simple as that.”

Labour has expelled or suspended dozens of members for making comments deemed anti-Semitic, but others have not been sanctioned or been readmitted.

Last year, Shami Chakrabarti, a human rights activist and Labour member, compiled a report on anti-Semitism in Labour that the Board of Deputies of British Jews and other mainstream communal groups said was a “whitewash.” The report asserted that while there is “occasionally toxic atmosphere” against Jews in Labour, anti-Semitism is not prevalent in the party’s ranks.

But a British parliamentary committee of inquiry last year upheld claims that the Labour Party’s leadership is failing to confront serious anti-Semitism in its ranks.

According to an analysis conducted by the Campaign Against Antisemitism of online chatter by Labour supporters, they are eight times likelier to express what the group deems anti-Semitic rhetoric than supporters of other large parties, whose chatter on social networks also was analyzed.