The mayor of the town of Corinth, west of Athens, pledged Friday to resist the move - which would see thousands of migrants temporarily lodged in camps around the country.
"It's a crime against Corinth," Mayor Alexandros Pnevmatikos told Skai TV.
"The town council has unanimously voted to escalate the struggle to throw out this camp," the socialist said, after a small group of protesters clashed with riot police outside the holding centre on Thursday.
The protest was led by the local chapter of Golden Dawn, a neo-Nazi group that has surged in popularity as recession-choked Greece battles to stay in the eurozone, winning 18 seats in June elections on immigration and crime fears.
"No law says army camps can be transformed into tourist centres for illegal immigrants," said party member Ilias Kasidiaris. "Members of the Golden Dawn and hundreds of citizens are going to react."
Another protest was due to be held in Corinth, west of Athens, in the evening.
The mayor has threatened to cut off the camp's water supply and rubbish garbage disposal until around 350 migrants brought in on Thursday are pulled out.
"We will do whatever is possible to avert this disaster," he said.
"This camp housed conscripts until five days ago... it's not suitable to act as a prison," the mayor said.
Towns in northern Greece also oppose the plan.
The government argues that the detentions will be temporary until migrants whose applications for refugee status are rejected can be deported.
Meanwhile in Athens Friday, thousands of mostly Pakistani immigrants gathered in front of Greece's parliament to protest at what they say is rising violence against them in one of the biggest demonstrations of its kind seen in the country.
Waving banners that read "No to fascist attacks" and "Neo-Nazis get out", protestors cited the death earlier this month of a young Iraqi in a hate attack, and recent "blasphemous" graffiti on walls in a Muslim area in the poor Athens suburb of Renti.
"If they hit us, well, we are used to it, but attacking Islam, that is unacceptable," said Zain, a 21-year-old Pakistani artist who gave only his first name.
Because of its geographical position, Greece serves as the main entry point for migrants from Asia and Africa crossing illegally into the European Union.
The recession-hit country has about 800,000 legally-registered immigrants, while the number of undocumented immigrants is estimated to be more than 350,000.
COMMENTS (4)
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Typical.
@Arjit Sharma: You simple miss the point, genius. Your comment as always is VAPID. The article highlights the growing hatred and/or violence against illegal immigrants. Regardless of their status, this does not justify violence against them. Moreover, the statement quoted simply expresses that the attack against their religion is unacceptable in the same way I find your usually stupid comments unacceptable. My expression and his expression of unacceptability does not equate to threats.
I would bet my life that even legal immigrants are receiving the same level of animosity from the Greeks because these immigrants, Pakistani or not, represent the "other", the unknown foreigners who are now in their homeland. Unlike some countries in Europe, Greek is not as culturally and racially diverse and may therefore have more problems dealing with the influx of immigrants (illegal or legal) and unfamiliar cultures that now co-exist with their culture.
Last but not the least, please read the article again and focus on the word "NEO-NAZI". Believe me, if you or your people are in the same situation, legal immigrant or not, Pakistani or not, Muslim or not, you will receive the same reaction from the this group.
Now, usual trolls like you would accuse me of being a Pakistani apologist. Before you do that, let me tell you I'm not Pakistani.
“ .... If they hit us, well, we are used to it, but attacking Islam, that is unacceptable,” said Zain, a 21-year-old Pakistani artist who gave only his first name. .... "
Lets see, you illegally enter your hosts house and then you threaten him ?
Pakistanis creating trouble in Greece. Its like scaling new frontiers for you guys. Making nusense of yourself in far off foreign countries where you do not even belong.