Dolores Huerta, the celebrated 1960s labor union leader and civil rights activist, died on Wednesday in California at the age of 96, her family said in a statement.

Huerta was a co-founder with Cesar Chavez, another veteran unionist and political activist, of the United Farm Workers union (UFW), which was credited with improving pay and conditions for agricultural workers through a series of strikes, boycotts and protests in the 1960s and 1970s.

• Dolores Huerta, California labor leader and civil rights champion, dies aged 96

Owner Gordon Brothers files notice of intent to begin process after rejecting management-backed rescue bid

• Business live – latest updates

The shop workers’ union Usdaw has urged Poundland’s owners to reconsider a decision to prepare the budget chain for administration, putting up to 12,000 jobs at risk.

Gordon Brothers filed a notice of intention to appoint administrators to Poundland at the high court on Thursday, with the advisory firm AlixPartners lined up to run the process.

Elizabeth Warren and others joined by unions and industry experts in warning against the weakening of regulations

The senator Elizabeth Warren, the congresswoman Ilhan Omar and several other Democratic lawmakers are calling on the Occupational Safety and Health Administration (Osha) to abandon a rollback of respirator mask regulations, a change the lawmakers say would weaken worker protections against hazardous substances.

Under the proposed rules, employers would face fewer requirements to provide workers with respirators masks when working with substances including “lead, asbestos, formaldehyde and inorganic arsenic, among other chemicals”, the lawmakers wrote in a letter to the Osha assistant secretary, David Keeling, a former UPS and Amazon executive.

Elizabeth Warren and others joined by unions and industry experts in warning against the weakening of regulations

The senator Elizabeth Warren, the congresswoman Ilhan Omar and several other Democratic lawmakers are calling on the Occupational Safety and Health Administration (Osha) to abandon a rollback of respirator mask regulations, a change the lawmakers say would weaken worker protections against hazardous substances.

Under the proposed rules, employers would face fewer requirements to provide workers with respirators masks when working with substances including “lead, asbestos, formaldehyde and inorganic arsenic, among other chemicals”, the lawmakers wrote in a letter to the Osha assistant secretary, David Keeling, a former UPS and Amazon executive.

Lawmakers, activists and union leaders across the US remember the co-founder of United Farm Workers union

Following the news that Dolores Huerta – the civil rights icon who popularized the rallying cry “Sí, se puede! – had died at the age of 96 on Wednesday, activists, lawmakers and civil rights leaders paid tribute to Hureta’s long and lasting legacy.

In California – where Huerta helped found the United Farm Workers (UFW) union – her death was deeply felt. It was in California’s central valley that she laid the foundations for the United Farm Workers, and helped organize the 1965 Delano grape strike – a national boycott of table grapes that resulted in better wages and working conditions for grape pickers. Several schools in California bear her name, and murals across the state depict her likeness. And in 2018, California declared 10 April – her birthday – Dolores Huerta Day.

Lawmakers, activists and union leaders across the US remember the co-founder of United Farm Workers union

Following the news that Dolores Huerta – the civil rights icon who popularized the rallying cry “Sí, se puede! – had died at the age of 96 on Wednesday, activists, lawmakers and civil rights leaders paid tribute to Hureta’s long and lasting legacy.

In California – where Huerta helped found the United Farm Workers (UFW) union – her death was deeply felt. It was in California’s central valley that she laid the foundations for the United Farm Workers, and helped organize the 1965 Delano grape strike – a national boycott of table grapes that resulted in better wages and working conditions for grape pickers. Several schools in California bear her name, and murals across the state depict her likeness. And in 2018, California declared 10 April – her birthday – Dolores Huerta Day.