行為は

the act is

→ 行為
phrase Uncommon #9,369
the act is 行為 means “act,” “action,” or “behavior,” while は marks it as the topic. The exact English translation depends on context and may be “your actions,” “that behavior,” or similar.
JA: その行為は許されません。
EN: That behavior is not acceptable.

彼の裏切り行為はそなた知るよりもはるかに深いものだ

His betrayal runs far deeper than you know.

— ロード・オブ・ザ・リング (2001)

その行為はここでは違法です

That act is illegal here.

彼のふしだら行為は気付かれずにすまなかった

His indecent behavior did not go unnoticed.

白人の暴力行為は白人自身非難すべきだ

White people themselves should condemn acts of violence committed by white people.

— マルコムX (1992)

彼の崇高な行為は本当に称賛に値する

His noble deed is truly worthy of praise.

その行為は彼の評判悪くした

That act damaged his reputation.

常識のある人だったらそんな行為は恥ずかしいと思うだろう

Anyone with common sense would be ashamed of such behavior.

そういう行為は法律違反

That kind of behavior is against the law.