Who is La Migra?

La migra generally refers to immigration officials or border patrol agents. Along the United States–Mexico border, it's the word for agents whose specific job is to arrest Mexican immigrants who have crossed into the United States illegally.
"La Migra" is also the title of a poem by the Mexican American writer Pat Mora. In the poem, the speaker says, "Let's play la Migra," first suggesting that she will be the border patrol, and the person she's addressing will be the "Mexican maid." In the second stanza, the proposed roles are reversed, and the speaker becomes the Mexican girl. She speaks to a border patrol agent whose Jeep has a flat. The girl then has the advantage because she knows the country and the desert surroundings, while the agent, who cannot even speak Spanish, is stuck in what is essentially a foreign land to him.