'who advocated for' is correct and usable in written English.
It is used when referring to people who publicly supported or promoted an idea. For example, "John Smith was a politician who advocated for equal rights for all citizens."
He frequently found himself in opposition to Alexander Graham Bell, who advocated for speech and lip reading.
Even Russell Portenoy, the Purdue-funded doctor who advocated for wider long-term use of opioids, has reassessed his views.
By all accounts, she was one of the people inside the Administration who advocated for keeping a residual force in Iraq.
Sanford Weill, the financier who advocated for the repeal of the Glass-Steagall Act, now thinks the government should split investment banking from banking.
Two main factions emerged: those who advocated for responsible government, led by Peter Cashin, and those who wanted union with Canada, led by Joseph ("Joey") Roberts Smallwood.
Hillary Clinton – who advocated for the controversial 1994 crime bill now so widely criticised – can only be assumed to care as little as her husband did.
Sands, who advocated for use of the hunger strike, immediately volunteered and was chosen to lead the strikes, which began on March 1 , 1981
Meanwhile, students, faculty members and alumni who advocated for a harder look at Cooper Union's expenses convened large assemblies to demand that the administration open its books.
The other is a soft-spoken blind activist who advocated for women and the disabled, and who irked the authorities enough to suffer their iron-blooded spirits firsthand.
It was Macdonald, for example, who advocated for Sarah Kane's Blasted back in 1995 – a play that would trigger appalled notices, headlines and a fraught Newsnight debate.
It was Mike Hoover and Bob Schuster, who advocated for him, and Dean Shaw, who got past his initial reaction, "It's the enemy".
