The Programmers Guild, an IT worker interest group, has filed 300 discrimination complaints this year against companies alleged to have posted “H-1B visa holders only” ads on job boards.该协会的程序员，一个IT工作者的利益集团，已经提交了300歧视的投诉，今年对公司据称已发布的“ H - 1B签证持有人只有”广告对议会的工作。

These job ads are accused of disregarding the Immigration and Nationality Act, which makes it illegal to discriminate against US workers on the basis of immigration status.这些招聘广告是被告无视移民和国籍法，这使得非法歧视美国工人的基础上的移民身份。 Link链接

Edit: As one commentator quickly pointed out the example given below isn’t correct.编辑：作为一位评论员很快指出，所举的例子下面是不正确的。 Thanks.谢谢。
A quick web search revealed this 快速的网络搜索显示，这 ad 广告 from Kemma Software: 从kemma软件：

Kemma Software will consider H1-B visa holders only if they currently hold a visa to be transferred. kemma软件将考虑H1 - B签证的签证持有人只有当他们目前持有签证被转移。

I am very much against such practices.我非常反对这种做法。 The spirit and intent of H1-B is to get foreign help only when the company cannot get help it needs (at the price it wants or can afford) from the local job market.的精神和意图H1 - B签证是得到外国的帮助，只有当公司不能获得帮助，这需要（在价格，要或可以负担）由本地就业市场。 The motives of such (”H1-B visa holders only”) companies are highly questionable.的动机，例如（ “ H1 - B签证的签证持有人只有” ）公司的高度质疑。

Update: Interestingly a dice search revealed most companies mentioning H1-B are stating that they cannot sponsor H1-B and very few saying that they will consider it for exceptional candidates only.更新：有趣的一骰子搜索显示，大多数公司提H1 - B签证是说明他们不能赞助H1 - B签证，很少说他们会考虑它的特殊候选人。