Keir Starmer doesn't want Labour MP's explicitly voting against bill that would attempt to protect the UK and soldiers from being held responsible for doing awful shit.

Labour has sacked three junior shadow ministers who joined with Jeremy Corbyn and 14 other Socialist Campaign group MPs in breaking the party’s whip by voting against the second reading of a controversial armed forces bill.

Sources close to the party’s leadership said that the three MPs were warned in advance that they could not remain in their posts as parliamentary private secretaries if they voted against the bill.

Nadia Whittome, Beth Winter and Olivia Blake defied the whip, which called on Labour MPs to abstain on the overseas operations bill. The legislation aims to introduce a presumption against prosecution for British soldiers serving abroad.

The group of rebels led by former party leader Corbyn also included John McDonnell, Diane Abbott and Rebecca Long-Bailey.

The proposed presumption against prosecution applies to offences such as war crimes and torture and critics say it breaches international humanitarian law, although the government says it is designed to end vexatious litigation against the armed forces.

“I thought the bill was a matter of conscience,” Whittome told ITV’s Robert Peston But she added that it was “reasonable” for colleagues to decide to abstain and try to amend the legislation during the later stages of its passage through parliament.

She said the bill was “anti-veteran, anti-human rights, and would effectively decriminalise torture – and that’s why I voted against it”.

Earlier, Corbyn had said: “I have grave concerns that, as it stands, the overseas operation bill the House of Commons is discussing today defies and undermines international law.”

The move against the three MPs is an indication of the firm discipline Keir Starmer intends to exert over his party — and underlines the continued tensions between leftwingers and the new leadership.

Party sources indicated they were not unhappy that Corbyn had broke with his successor Starmer over the bill, arguing that it created a dividing line between the past and present leaders.