The old Left, that which helped create the White Australia Policy, was anti-globalist, and nationalist. This Left was displaced by the 1960s revolution, which saw feminism and identity politics, filtered through cultural Marxism, arise. Yet, our enemies are not completely homogeneous, as an interesting article from the Left/socialist position by Angela Nagle, “The Left Case Against Open Borders,” details:
  https://americanaffairsjournal.org/2018/11/the-left-case-against-open-borders/

“The transformation of open borders into a “Left” position is a very new phenomenon and runs counter to the history of the organized Left in fundamental ways. Open borders has long been a rallying cry of the business and free market Right. Drawing from neoclassical economists, these groups have advocated for liberalizing migration on the grounds of market rationality and economic freedom. They oppose limits on migration for the same reasons that they oppose restrictions on the movement of capital. The Koch-funded Cato Institute, which also advocates lifting legal restrictions on child labor, has churned out radical open borders advocacy for decades, arguing that support for open borders is a fundamental tenet of libertarianism, and “Forget the wall already, it’s time for the U.S. to have open borders.” The Adam Smith Institute has done much the same, arguing that “Immigration restrictions make us poorer.”

Following Reagan and figures like Milton Friedman, George W. Bush championed liberalizing migration before, during, and after his presidency. Grover Norquist, a zealous advocate of Trump’s (and Bush’s and Reagan’s) tax cuts, has for years railed against the illiberalism of the trade unions, reminding us, “Hostility to immigration has traditionally been a union cause.” He’s not wrong. From the first law restricting immigration in 1882 to Cesar Chavez and the famously multiethnic United Farm Workers protesting against employers’ use and encouragement of illegal migration in 1969, trade unions have often opposed mass migration. They saw the deliberate importation of illegal, low-wage workers as weakening labor’s bargaining power and as a form of exploitation. There is no getting around the fact that the power of unions relies by definition on their ability to restrict and withdraw the supply of labor, which becomes impossible if an entire workforce can be easily and cheaply replaced. Open borders and mass immigration are a victory for the bosses.

And the bosses almost universally support it. Mark Zuckerberg’s think tank and lobbying organization, Forward, which advocates for liberalizing migration policies, lists among its “founders and funders” Eric Schmidt and Bill Gates, as well as CEOs and senior executives of YouTube, Dropbox, Airbnb, Netflix, Groupon, Walmart, Yahoo, Lyft, Instagram, and many others. The cumulative personal wealth represented on this list is enough to heavily influence most governing institutions and parliaments, if not buy them outright. While often celebrated by progressives, the motivations of these “liberal” billionaires are clear. Their generosity toward dogmatically anti-labor Republicans, like Jeff Flake of the famous “Gang of Eight” bill, should come as no surprise.

Today’s well-intentioned activists have become the useful idiots of big business. With their adoption of “open borders” advocacy—and a fierce moral absolutism that regards any limit to migration as an unspeakable evil—any criticism of the exploitative system of mass migration is effectively dismissed as blasphemy. Even solidly leftist politicians, like Bernie Sanders in the United States and Jeremy Corbyn in the United Kingdom, are accused of “nativism” by critics if they recognize the legitimacy of borders or migration restriction at any point. This open borders radicalism ultimately benefits the elites within the most powerful countries in the world, further disempowers organized labor, robs the developing world of desperately needed professionals, and turns workers against workers.

But the Left need not take my word for it. Just ask Karl Marx, whose position on immigration would get him banished from the modern Left. Although migration at today’s speed and scale would have been unthinkable in Marx’s time, he expressed a highly critical view of the effects of the migration that occurred in the nineteenth century. In a letter to two of his American fellow-travelers, Marx argued that the importation of low-paid Irish immigrants to England forced them into hostile competition with English workers. He saw it as part of a system of exploitation, which divided the working class and which represented an extension of the colonial system. He wrote:

Owing to the constantly increasing concentration of leaseholds, Ireland constantly sends her own surplus to the English labour market, and thus forces down wages and lowers the material and moral position of the English working class. And most important of all! Every industrial and commercial centre in England now possesses a working class divided into two hostile camps, English proletarians and Irish proletarians. The ordinary English worker hates the Irish worker as a competitor who lowers his standard of life. In relation to the Irish worker he regards himself as a member of the ruling nation and consequently he becomes a tool of the English aristocrats and capitalists against Ireland, thus strengthening their domination over himself. He cherishes religious, social, and national prejudices against the Irish worker. His attitude towards him is much the same as that of the “poor whites” to the Negroes in the former slave states of the U.S.A. The Irishman pays him back with interest in his own money. He sees in the English worker both the accomplice and the stupid tool of the English rulers in Ireland. This antagonism is artificially kept alive and intensified by the press, the pulpit, the comic papers, in short, by all the means at the disposal of the ruling classes. This antagonism is the secret of the impotence of the English working class, despite its organisation. It is the secret by which the capitalist class maintains its power. And the latter is quite aware of this.”

     This all shows how truly bad things are now, when the father of communism, would be regarded as a “racist” by the cubs of the Left today. Of course, a Leftist revolt against immigration, and embrace of nationalism is impossible, because that position has been well and truly lost. Yet it is useful to see what the Left held in the past, and it could be used as propaganda in future debates.