Four protesters attached themselves to machinery at Bisalloy's Unanderra site, on Friday morning, protesting the steel manufacturer's links to the Israeli Defence Forces.
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Participant Leya Reid said the group was protesting Bisalloy's involvement in the war in Gaza.
"Bisalloy sells armoured steel to Israeli Occupation Forces which they use for tanks. We must all do whatever we can to stop this brutal attack."
A NSW Police spokesperson said 15 people arrived at the site at 6.40am.
Officers arrived shortly after and began to disperse the group.
Four women were charged with enter inclosed land not prescribed premises without lawful excuse and were each later released from Lake Illawarra police station.
Bisalloy has contracts to supply armoured steel to Israeli defence firms Rafael Advanced Defence Systems and Plasan Kibbutz Sasa.
"We are calling on Bisalloy to immediately cancel all contracts with Israel, Rafael, Plasan, and any other entities that make war their business. Until then we will act to disrupt their business as much as we can," Ms Reid said.
Comment has been sought from Bisalloy.
Since October 7 last year, when Hamas and other fighters from Gaza struck southern Israel, killing 1100 people and taking around 250 hostages, Israel has killed over 30,000 people in Gaza, including 13,000 children, according to local officials.
Speaking after their release, Ms Reid said the group were disrupting Bisalloy's operations due to their supply of armoured steel to Israeli defence firms.
Fellow protester Dalia said Australia was "directly complicit" in the conflict in Gaza, where Australian aid worker Zomi Frankcom was killed in by Israeli drone strike this week.
"Australia is directly complicit by funding and sending arms and armoured steel," she said.
"We call for an immediate and sustained ceasefire, we need to assist Palestinians in sustaining their right to life."
It is the second time that protesters have disrupted Bisalloy's operations since October 7, with protesters entering the company's offices in December.
Protest organiser Mark Gert said the action was part of a history of anti-war activism in the Illawarra, including the Dalfram dispute, anti-conscription protests during the Vietnam War and more recently protests against the AUKUS pact.
"There's a long legacy of anti-war protests," he said. "This is an example of community action to disrupt that supply chain and contribute to the solidarity with the Palestinian struggle for life, dignity and freedom."